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Summary of Restricted Stock Activity (Detail) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Shares Outstanding      
Beginning Balance 1,077,731    
Granted 476,556    
Vested (358,966)    
Canceled/Forfeited (64,554)    
Ending Balance 1,130,767 1,077,731  
Expected to vest as of end of period 765,271    
Weighted Average Grant Price      
Beginning Balance $ 98.15    
Granted 139.50 $ 134.34 $ 88.84
Vested 72.56    
Canceled/Forfeited 126.64    
Ending Balance 122.08 $ 98.15  
Expected to vest as of end of period $ 121.25