Capital Stock - Summary of Common Stock Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balances (in shares)	37,448,310
Stock options exercised (in shares)	64,752	190,743	277,687
Ending Balances (in shares)	37,372,474	37,448,310
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balances (in shares)	62,081,391	62,081,391	62,081,391
Ending Balances (in shares)	62,081,391	62,081,391	62,081,391
Beginning Balances	$ 148,401	$ 132,055	$ 112,135
Tax benefit related to stock plans	596	2,573	2,246
Ending Balances	$ 157,642	$ 148,401	$ 132,055
Stock Compensation Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balances (in shares)	0	(303,668.000)	(745,430)
Ending Balances (in shares)	0	0	(303,668.000)
Beginning Balances	$ 0	$ (1,585)	$ (3,891)
Ending Balances	$ 0	$ 0	$ (1,585)
Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balances (in shares)	(24,633,081)	(24,575,624)	(24,328,162)
Share repurchase program (in shares)	(150,000)
Ending Balances (in shares)	(24,708,917)	(24,633,081)	(24,575,624)
Beginning Balances	$ (284,805)	$ (279,772)	$ (267,987)
Share repurchase program	(7,104)
Ending Balances	(293,318)	(284,805)	(279,772)
Restricted Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock awards	(404)	(538)	(505)
Share-based compensation expense	3,461	4,372	4,244
Restricted stock forfeitures	$ (426)	$ (346)	$ (115)
Restricted Stock | Stock Compensation Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock awards (in shares)		72,291	96,686
Restricted stock awards		$ 377	$ 505
Restricted Stock | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock awards (in shares)	34,624	13,936
Restricted stock forfeitures (in shares)	(18,468)	(4,078)	(7,365)
Restricted stock awards	$ 404	$ 161
Stock Options | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	2,572	2,355	$ 2,825
Stock options exercised	1,714	$ 5,678	$ 8,194
Stock option forfeitures	$ (118)
Stock Options | Stock Compensation Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)		150,962	277,687
Stock options exercised		$ 788	$ 1,449
Stock Options | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)	52,708	39,781
Stock options exercised	$ 216	$ 460
Performance Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	2,265	2,705	3,383
Performance stock issued	(616)	$ (420)	$ (352)
Performance stock forfeitures	$ (155)
Performance Stock | Stock Compensation Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Performance stock issued (in shares)		80,415	67,389
Performance stock issued		$ 420	$ 352
Performance Stock | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Performance stock issued (in shares)	52,839
Performance stock issued	$ 616
Treasury | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares purchased (in shares)	(59,056)	(107,096)	(240,097)
Treasury shares purchased for stock compensation programs	$ (2,781)	$ (5,654)	$ (11,785)
Employee Stock Purchase Plan | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Performance stock issued	$ 352
Employee Stock Purchase Plan | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee stock purchase plan (in shares)	11,517
Performance stock issued	$ 136