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Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Options outstanding, shares      
Beginning Balance 1,201 600 16
Granted 380 745 600
Exercised (91) (9) (16)
Forfeited/Expired (167) (135) 0
Ending Balance 1,323 1,201 600
Exercisable as of December 31, 2015 334    
Expected to vest as of December 31, 2015 989    
Total 1,323    
Weighted Average Exercise Price Per Share      
Beginning Balance $ 111.77 $ 92.84 $ 20.81
Granted 178.93 125.46 92.84
Exercised 105.25 92.84 20.81
Forfeited/Expired 131.31 104.48 0
Ending Balance 129.04 $ 111.77 $ 92.84
Exercisable as of December 31, 2015 105.20    
Expected to vest as of December 31, 2015 137.09    
Total $ 129.04    
Aggregate Intrinsic Value      
Exercised $ 6,367 $ 653 $ 1,262
Exercisable as of December 31, 2015 24,746    
Expected to vest as of December 31, 2015 44,581    
Total $ 69,327    
Weighted Average Remaining Contractual Term (Years)      
Exercisable as of December 31, 2015 7 years 10 months 24 days    
Expected to vest as of December 31, 2015 8 years 7 months 6 days    
Total 8 years 4 months 24 days