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Stock-based Compensation Plans - Additional Information 1 (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense $ 57,801 $ 70,681 $ 64,369
Performance Shares      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense 8,700 7,900 $ 0
Unrecognized compensation related to Awards $ 15,700    
Weighted average period 1 year 10 months 24 days    
Former Executive Chairman      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense   $ 6,700