Share Based Compensation - Summary of Changes in Number of Shares of Common Stock Under Option (Detail) - Jun. 30, 2015 - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Total
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Outstanding, Beginning Balance	5,131
Shares, Granted	271
Shares, Exercised	(209)
Shares, Forfeited	(25)
Shares, Outstanding, Ending Balance	5,168
Shares,Expected to vest	5,168
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 58.71
Weighted Average Exercise Price, Granted	155.95
Weighted Average Exercise Price, Exercised	33.90
Weighted Average Exercise Price, Forfeited	105.36
Weighted Average Exercise Price, Outstanding, Ending balance	64.60
Weighted Average Exercise Price, Expected to vest	$ 64.60
Options Exercisable at End of Period, Outstanding, Beginning Balance	2,370
Options Exercisable at End of Period, Outstanding, Ending Balance	2,476
Weighted Average Exercise Price of Exercisable Options, Outstanding, Beginning Balance	$ 21.75
Weighted Average Exercise Price of Exercisable Options, Outstanding, Ending Balance	23.68
Weighted Average Fair Value of Options Granted During the Period, Granted	$ 38.07
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$ 461,770
Aggregate Intrinsic Value, Exercised	25,541
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 472,719