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Retirement Plan - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] | |||
| Retirement plan contribution by company | $ 2.6 | $ 1.9 | $ 2.1 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of discretionary contributions made by an employer to a defined contribution plan. No definition available.
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