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Stock-Based Compensation (Detail) - (Table 5)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 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 72,500
Granted (in Dollars per share) | $ / shares $ 32.44
Exercised | shares (410,500)
Exercised (in Dollars per share) | $ / shares $ 9.04
Cancelled/Forfeited | shares (17,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price | $ / shares $ 29.85
Outstanding at June 30, 2012 | shares 1,661,000
Outstanding at June 30, 2012 (in Dollars per share) | $ / shares $ 27.40
Outstanding at June 30, 2012 3 years 2 months
Outstanding at June 30, 2012 (in Dollars) | $ $ 11,247
Exercisable at June 30, 2012 | shares 1,184,000
Exercisable at June 30, 2012 (in Dollars per share) | $ / shares $ 24.85
Exercisable at June 30, 2012 2 years 7 months
Exercisable at June 30, 2012 (in Dollars) | $ $ 11,051