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Equity-Based Compensation - Schedule of Assumptions Used to Estimate Fair Value of Stock Options (Detail)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |||
| Expected volatility, minimum | 35.00% | 37.00% | |
| Expected volatility, maximum | 40.00% | 40.00% | 39.00% |
| Risk-free interest rate, minimum | 1.00% | 1.00% | 1.00% |
| Risk-free interest rate, maximum | 1.35% | 1.35% | 1.35% |
| Expected term (years) | 6 years 3 months | 6 years 3 months | 6 years 3 months |
| Dividend yield | 0.00% | 0.00% | 0.00% |