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Employee Benefit Plan - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] | |||
| Plan contributions cost | $ 3.6 | $ 2.8 | $ 2.4 |
| Participation waiting period | 30 days | ||
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First 4 percent of employees pre-tax contributions [Member]
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| Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] | |||
| Employee vested percentage | 100.00% | ||
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Next 2 percent of employees pre-tax contributions [Member]
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| Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] | |||
| Employee vested percentage | 50.00% | ||