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Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | |||||||||||||||||||||||||||||||
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Feb. 28, 2011
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Jun. 30, 2010
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Feb. 28, 2010
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Dec. 31, 2011
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Dec. 31, 2009
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Dec. 31, 2012
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Sep. 30, 2011
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Jun. 30, 2010
Minimum
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Dec. 31, 2009
Minimum
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Dec. 31, 2009
Scenario 1
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Dec. 31, 2009
Scenario 1
Minimum
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Dec. 31, 2009
Scenario 2
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Dec. 31, 2009
Scenario 2
Minimum
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Dec. 31, 2011
Federal Funds Rate
|
Dec. 31, 2009
Federal Funds Rate
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Feb. 28, 2011
Federal Funds Rate
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Jun. 30, 2010
Federal Funds Rate
Maximum
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Sep. 30, 2012
LIBOR
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Dec. 31, 2011
LIBOR
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Feb. 28, 2011
LIBOR
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Dec. 31, 2009
LIBOR
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Sep. 30, 2012
LIBOR
Minimum
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Dec. 31, 2011
LIBOR
Minimum
|
Feb. 28, 2011
LIBOR
Minimum
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Sep. 30, 2012
LIBOR
Maximum
|
Dec. 31, 2011
LIBOR
Maximum
|
Feb. 28, 2011
LIBOR
Maximum
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Jun. 30, 2010
LIBOR
Maximum
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Jun. 30, 2010
Wells Fargo
Minimum
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Dec. 31, 2011
Wells Fargo's prime rate
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Dec. 31, 2011
Wells Fargo's prime rate
Minimum
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Feb. 28, 2011
Wells Fargo's prime rate
Minimum
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Dec. 31, 2011
Wells Fargo's prime rate
Maximum
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Feb. 28, 2011
Wells Fargo's prime rate
Maximum
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Feb. 28, 2010
Term Loan
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Dec. 31, 2009
Term Loan
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Dec. 31, 2011
Revolving Credit Facility
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Feb. 28, 2011
Revolving Credit Facility
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Dec. 31, 2010
Revolving Credit Facility
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Dec. 31, 2009
Revolving Credit Facility
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Nov. 30, 2010
Term Loan Facility Additional Delayed Draw
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Jun. 30, 2010
Term Loan Facility Additional Delayed Draw
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Dec. 31, 2011
Standby Letters of Credit
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| Line of Credit Facility [Line Items] | |||||||||||||||||||||||||||||||||||||||||||
| Line of credit facility | $ 35.0 | $ 37.0 | $ 10.0 | $ 10.0 | $ 30.0 | ||||||||||||||||||||||||||||||||||||||
| Interest rate descriptions | In addition, the interest rates on the term loan and revolving line of credit were amended to provide for a rate that was dependent on our leverage ratio and ranged from a stated rate of 2.75% to 3.25% plus LIBOR or, at our option, a stated rate of 0.0% to 0.5% plus Wells Fargo's prime rate (or, if greater, the federal funds rate plus 0.5% or three month LIBOR plus 1.0%). | After the June 2010 amendment, the term loan and revolving line of credit bore interest at a stated rate of 3.5% plus LIBOR, or a stated rate of 0.75% plus Wells Fargo's prime rate (or, if greater, the federal funds rate plus 0.5% or three month LIBOR plus 1.0%). | Revolving loans accrue interest at a per annum rate equal to, at the Company's option, either LIBOR or Wells Fargo's prime rate (or, if greater, the federal funds rate plus 0.50% or three month LIBOR plus 1.00%), in each case plus a margin ranging from 2.50% to 3.00%, in the case of LIBOR loans, and 0.00% to 0.25% in the case of prime rate loans, based upon the Company's senior leverage ratio. | The term loan and revolving line of credit bore interest at rates of the greater of 7.5%, a stated rate of 5.0% plus LIBOR (or if greater, 2.5%) or a stated rate of 5.0% plus the bank's prime rate (or, if greater than 3.5%, the federal funds rate plus 0.5% or three month LIBOR plus 1.0%). | The federal funds rate plus 0.50% | The federal funds rate plus 0.50% | The terms of the amendment, the LIBOR rate margin ranges from 2.00% to 2.50%, based on our senior leverage ratio | 2.50% to 3.00% plus LIBOR | 0.00% to 0.25% plus Wells Fargo's prime rate | ||||||||||||||||||||||||||||||||||
| Line of credit facility, interest rate | 7.50% | ||||||||||||||||||||||||||||||||||||||||||
| Basis spread on interest rate | 2.50% | 3.50% | 0.50% | 0.50% | 0.50% | 0.50% | 1.00% | 1.00% | 1.00% | 2.00% | 2.50% | 2.75% | 2.50% | 3.00% | 3.25% | 1.00% | 0.00% | 0.00% | 0.25% | 0.50% | |||||||||||||||||||||||
| Stated interest rate above LIBOR rate | 3.50% | 5.00% | |||||||||||||||||||||||||||||||||||||||||
| Stated interest rate above prime rate | 5.00% | 0.75% | |||||||||||||||||||||||||||||||||||||||||
| Additional borrowing under credit facility | 10.0 | 30.0 | |||||||||||||||||||||||||||||||||||||||||
| Payment of quarterly installment on term loan | 1.8 | ||||||||||||||||||||||||||||||||||||||||||
| Percentage of principal amount paid quarterly | 3.75% | ||||||||||||||||||||||||||||||||||||||||||
| Revolving line of credit facility borrowed | 7.6 | 50.3 | 10.0 | ||||||||||||||||||||||||||||||||||||||||
| Sub limit for issuance of letters of credit | 10.0 | ||||||||||||||||||||||||||||||||||||||||||
| Revolving line of credit facility, available borrowing capacity | 140.0 | 150.0 | |||||||||||||||||||||||||||||||||||||||||
| Principal together with accrued and unpaid interest due and payable, date | Dec. 30, 2015 | ||||||||||||||||||||||||||||||||||||||||||
| Unamortized debt issuance costs | 1.3 | 0.8 | |||||||||||||||||||||||||||||||||||||||||
| Issuance of letters of credit outstanding, amount | $ 10.0 | ||||||||||||||||||||||||||||||||||||||||||