XML 54 R43.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Jul. 20, 2017
Aug. 08, 2016
Jul. 03, 2012
Feb. 08, 2012
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
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         324,352 231,837    
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)         $ 36.60 $ 32.65    
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number         1,114,716      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized         $ 9,588      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition         3 years 2 months      
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized         $ 66,243      
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition         5 years 2 months      
Related Party Transaction Restricted Shares Granted During The Period     1,893,342 1,463,057        
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period         600,000 750,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 150,000 150,000     210,000      
Common Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share Price   $ 34.42 $ 21.13 $ 27.34   $ 37.35 $ 40.15