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- Summary of Restricted Stock Activity (Detail) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares Outstanding      
Beginning Balance 1,130,767    
Granted 909,161    
Vested (233,841)    
Canceled/Forfeited (284,885)    
Ending Balance 1,521,202 1,130,767  
Expected to vest as of end of period 955,106    
Weighted Average Grant Price      
Beginning Balance $ 122.08    
Granted 77.53 $ 139.50 $ 134.34
Vested 89.72    
Canceled/Forfeited 108.08    
Ending Balance 103.05 $ 122.08  
Expected to vest as of end of period $ 101.57