Equity-Based Compensation - Fair Value of Stock Option Awards Determined on Grant Date Using Black-Scholes Valuation Model (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected term (years)	6 years 3 months	6 years 3 months
Expected volatility, Minimum	33.20%
Expected volatility, Maximum	34.40%
Risk-free interest rate, Minimum	1.31%	1.70%
Risk-free interest rate, Maximum	1.76%	1.82%
Expected volatility		35.40%