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Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 03, 2012
Feb. 08, 2012
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jul. 20, 2017
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     56,355 21,006 349,030 261,715      
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 34.72 $ 32.72 $ 33.35 $ 31.92      
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     1,294,680   1,294,680        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 9,449   $ 9,449        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     4 years 7 months            
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 66,808   $ 66,808        
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition     5 years 7 months            
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  
Subsequent Event [Member] | Common Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share Price             $ 40.15