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Summary of Non-Vested Restricted Stock Unit Activity (Detail) - Restricted Stock With Service Based Vesting Conditions - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]      
Shares, Non-vested units as of December 31, 2014 1,540,703    
Shares, Granted 1,234,650    
Shares, Vested (489,301)    
Shares, Forfeited (138,843)    
Shares, Non-vested units as of December 31, 2015 2,147,209 1,540,703  
Shares, Non-vested units expected to vest at December 31, 2015 1,895,918    
Weighted Average Grant Date Fair Value, Non-vested units as of December 31, 2014 $ 59.46    
Weighted Average Grant Date Fair Value, Granted 119.86 $ 64.37 $ 66.81
Weighted Average Grant Date Fair Value, Vested 54.48    
Weighted Average Grant Date Fair Value, Forfeited 81.67    
Weighted Average Grant Date Fair Value, Non-vested units as of December 31, 2015 93.89 $ 59.46  
Weighted Average Grant Date Fair Value, Non-vested units expected to vest at December 31, 2015 $ 92.56    
Weighted Average Remaining Years, Non-vested units as of December 31, 2014 2 years 9 months 18 days 2 years 10 months 24 days  
Aggregate Intrinsic Value, Non-vested units as of December 31, 2014 $ 139,280    
Aggregate Intrinsic Value, Non-vested units as of December 31, 2015 224,942 $ 139,280  
Aggregate Intrinsic Value, Non-vested units expected to vest at December 31, 2015 $ 199,917