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Retirement Plan - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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| Compensation and Retirement Disclosure [Abstract] | ||
| Retirement plan contribution by company | $ 2.6us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 2.7us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount |
| 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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