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Debt - Additional Information (Details) (USD $)
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0 Months Ended | 6 Months Ended | |||||||||
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May 09, 2014
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Jun. 30, 2014
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Dec. 31, 2013
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Jun. 30, 2014
Federal Funds Rate
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Jun. 30, 2014
LIBOR
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Jun. 30, 2014
LIBOR
Minimum
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Jun. 30, 2014
LIBOR
Maximum
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Jun. 30, 2014
Wells fargo's prime rate
Minimum
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Jun. 30, 2014
Wells fargo's prime rate
Maximum
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Jun. 30, 2014
Revolving Credit Facility
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Jun. 30, 2014
Standby Letters of Credit
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| Line of Credit Facility [Line Items] | |||||||||||
| Revolving line of credit facility, available borrowing capacity | $ 125,000,000.0 | $ 150,000,000.0 | |||||||||
| Sub limit for issuance of letters of credit | 10,000,000.0 | ||||||||||
| Basis spread on interest rate | 0.50% | 1.00% | 2.00% | 2.50% | 0.00% | 0.25% | |||||
| Authorized amount of common stock repurchase | 75,000,000 | ||||||||||
| Value of equipment in hands of employees, consultants, or customers | 2,500,000.0 | ||||||||||
| Aggregate permitted acquisition limit | 150,000,000.0 | ||||||||||
| Additional borrowing capacity under certain conditions | 100,000,000.0 | ||||||||||
| Revolving line of credit, outstanding amount | 25,000,000 | 0 | |||||||||
| Issuance of letters of credit outstanding, amount | 10,000,000.0 | ||||||||||
| Unamortized debt issuance costs | $ 200,000 | $ 300,000 | |||||||||