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Debt (Detail) (USD $)
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12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2013
Federal Funds Rate
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Dec. 31, 2013
LIBOR
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Sep. 30, 2012
LIBOR
Minimum
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Dec. 31, 2013
LIBOR
Minimum
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Sep. 30, 2012
LIBOR
Maximum
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Dec. 31, 2013
LIBOR
Maximum
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Dec. 31, 2013
Wells Fargo's prime rate
Minimum
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Dec. 31, 2013
Wells Fargo's prime rate
Maximum
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Dec. 31, 2013
Revolving Credit Facility
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Dec. 31, 2013
Standby Letters of Credit
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| Line of Credit Facility [Line Items] | ||||||||||||
| Line of credit facility | $ 150,000,000 | |||||||||||
| Sub limit for issuance of letters of credit | 10,000,000 | |||||||||||
| Basis spread on interest rate | 0.50% | 1.00% | 2.00% | 2.50% | 2.50% | 3.00% | 0.00% | 0.25% | ||||
| Principal together with accrued and unpaid interest due and payable, date | Dec. 30, 2015 | |||||||||||
| Revolving line of credit facility borrowed | 10,000,000 | 0 | ||||||||||
| Revolving line of credit facility, available borrowing capacity | 150,000,000 | |||||||||||
| Issuance of letters of credit outstanding, amount | 10,000,000 | |||||||||||
| Unamortized debt issuance costs | $ 800,000 | $ 300,000 | ||||||||||