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Stock-Based Compensation (Detail) - (Table 5)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at January 1, 2012 | shares 2,016,000
Outstanding at January 1, 2012 (in Dollars per share) | $ / shares $ 23.51
Granted | shares 63,500
Granted (in Dollars per share) | $ / shares $ 31.91
Exercised | shares (410,000)
Exercised (in Dollars per share) | $ / shares $ 9.00
Cancelled/Forfeited | shares (16,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price | $ / shares $ 29.27
Outstanding at June 30, 2012 | shares 1,653,500
Outstanding at June 30, 2012 (in Dollars per share) | $ / shares $ 27.36
Outstanding at June 30, 2012 3 years 5 months
Outstanding at June 30, 2012 (in Dollars) | $ $ 16,012
Exercisable at June 30, 2012 | shares 1,161,000
Exercisable at June 30, 2012 (in Dollars per share) | $ / shares $ 24.66
Exercisable at June 30, 2012 2 years 9 months
Exercisable at June 30, 2012 (in Dollars) | $ $ 14,373