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Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Jul. 03, 2012
Feb. 08, 2012
Mar. 31, 2017
Mar. 31, 2016
Aug. 08, 2016
May 25, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           23,466,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period     231,837 214,328    
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 32.65 $ 31.63    
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     1,264,540      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 10,371      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     3 years 10 months      
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 72,689      
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition     6 years      
Related Party Transaction Restricted Shares Granted During The Period 1,893,342 1,463,057        
Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share Price $ 21.13 $ 27.34     $ 34.42