Equity-Based Compensation - Schedule of Market-Based RSUs (Detail) (Market-Based Restricted Stock Units [Member])	0 Months Ended
	Feb. 14, 2014 Companies	Feb. 11, 2013 Companies	Feb. 01, 2012	Feb. 01, 2012 Companies
Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target based Vesting of market-based restricted stock unit	25,085	32,500		45,850
Market-based restricted stock unit awards year of award granted	2017	2016	2014
Number of enumerated peer group companies	15	20		28
Earned and awarded performance and market-based restricted stock unit			63,800
Certain Executives and Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target based Vesting of market-based restricted stock unit		77,700
Market-based restricted stock unit awards year of award granted		2016
Number of enumerated peer group companies		20