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Summarizes Stock Appreciation Rights (SARs) Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock Options Outstanding, beginning balance, Shares 2,103,470 1,530,845 1,674,534
Granted, Shares 808,500 862,000 524,534
Exercised, Shares (202,328) (112,875) (571,723)
Forfeited, Shares (57,500) (176,500) (96,500)
Stock Options Outstanding, ending balance, Shares 2,652,142 2,103,470 1,530,845
Exercisable, Ending Balance 984,374 675,152 439,561
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price $ 32.72 $ 27.46 $ 19.14
Granted, Weighted-Average Exercise Price 37.23 40.87 41.97
Exercised, Weighted-Average Exercise Price 13.62 13.24 16.21
Forfeited, Weighted-Average Exercise Price 42.54 39.32 28.47
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price 35.34 32.72 27.46
Exercisable, Weighted Average Exercise Price $ 29.84 $ 21.40 $ 12.18
Stock Options Outstanding, Weighted-Average Remaining Contractual Term 4 years 9 months 3 days 4 years 10 months 9 days 4 years 11 months 19 days
Exercisable, Weighted-Average Remaining Contractual Term 3 years 5 months 8 days 3 years 5 months 12 days 3 years 6 months 3 days
Outstanding, Aggregate Intrinsic Value $ 6,964 $ 12,265 $ 30,573
Exercisable, Aggregate Intrinsic Value $ 6,534 $ 9,646 $ 15,480
Stock Appreciation Rights (SARs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock Options Outstanding, beginning balance, Shares 1,244,600 1,049,850 1,060,250
Granted, Shares 235,000 244,000 259,600
Exercised, Shares (94,250) (18,750) (167,500)
Forfeited, Shares (193,000) (30,500) (102,500)
Stock Options Outstanding, ending balance, Shares 1,192,350 1,244,600 1,049,850
Exercisable, Ending Balance 613,808 424,992 153,575
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price $ 36.11 $ 34.61 $ 29.97
Granted, Weighted-Average Exercise Price 38.05 40.64 43.97
Exercised, Weighted-Average Exercise Price 22.21 24.28 23.90
Forfeited, Weighted-Average Exercise Price 32.53 28.23 27.82
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price 38.17 36.11 34.61
Exercisable, Weighted Average Exercise Price $ 37.68 $ 34.49 $ 38.12
Stock Options Outstanding, Weighted-Average Remaining Contractual Term 4 years 4 months 9 days 4 years 9 months 18 days 5 years 5 months 15 days
Exercisable, Weighted-Average Remaining Contractual Term 3 years 8 months 19 days 4 years 4 months 20 days 5 years 7 months 2 days
Outstanding, Aggregate Intrinsic Value $ 2,278 $ 3,511 $ 13,425
Exercisable, Aggregate Intrinsic Value $ 1,904 $ 2,315 $ 1,425