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Equity-Based Compensation - Assumptions Used in Determining Fair Value of Performance Unit Grant (Detail) - Performance-based Restricted Stock Units (PSUs) [Member]
3 Months Ended
Mar. 31, 2017
Schedule Of Share Based Compensation Valuation Assumptions [Line Items]  
Expected volatility 27.96%
Risk-free rate 1.54%
Expected term (in years) 2 years 9 months 26 days