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Employee Benefit Plans - 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] | ||
| Employer contributions | $ 0.6us-gaap_DefinedBenefitPlanContributionsByEmployer | $ 0.1us-gaap_DefinedBenefitPlanContributionsByEmployer |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The increase in the fair value of plan assets from contributions made by the employer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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