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Stock-Based Compensation (Detail) - (Table 5) - Jun. 30, 2015 - USD ($)
$ / shares in Units, $ in Thousands
Total
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at January 1, 2012 3,428,000
Outstanding at January 1, 2012 (in Dollars per share) $ 19.48
Granted 59,000
Granted (in Dollars per share) $ 35.78
Exercised (1,309,000)
Exercised (in Dollars per share) $ 15.06
Cancelled/Forfeited (9,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 29.59
Outstanding at June 30, 2012 2,169,000
Outstanding at June 30, 2012 (in Dollars per share) $ 22.57
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 5 years
Outstanding at June 30, 2012 (in Dollars) $ 42,046
Exercisable at June 30, 2012 1,457,000
Exercisable at June 30, 2012 (in Dollars per share) $ 17.55
Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsexercisableweightedaverageexerciseprice2 2 years 6 months
Exercisable at June 30, 2012 (in Dollars) $ 35,558