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Capital Stock - Summary of Common Stock Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balances (in shares)	(38,222,928)
Stock options exercised (in shares)	215,724	620,646	341,063
Stock options forfeitures, Shares			(12,753)
Ending Balances (in shares)	(38,526,523)	(38,222,928)
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	$ (194,953)	$ (172,681)	$ (157,643)
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options			478
Ending Balances	$ (211,806)	$ (194,953)	$ (172,681)
Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balances (in shares)	(23,858,463)	(24,344,813)	(24,708,917)
Ending Balances (in shares)	(23,554,868)	(23,858,463)	(24,344,813)
Beginning Balances	$ (296,081)	$ (287,501)	$ (293,318)
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options			0
Ending Balances	$ (296,390)	(296,081)	$ (287,501)
Noncontrolling Interest | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Acquisitions		450
Noncontrolling Interest | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Acquisitions		$ 0
Restricted Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock awards (in shares)	0	0	0
Restricted stock forfeitures (in shares)		0	0
Restricted stock awards	$ (1,079)	$ (422)	$ (355)
Share-based compensation expense	6,504	4,746	3,604
Stock compensation awards forfeited, Value	$ (283)	$ (49)	$ (148)
Restricted Stock | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock awards (in shares)	92,401	34,798	29,836
Restricted stock forfeitures (in shares)		(690)	(2,800)
Restricted stock awards	$ (1,079)	$ (422)	$ (355)
Share-based compensation expense	0	0	0
Stock compensation awards forfeited, Value	$ 0	$ (6)	$ 0
Stock Options | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)	0	0	0
Stock options forfeitures, Shares			0
Share-based compensation expense	$ 272	$ 380	$ 2,484
Stock compensation awards forfeited, Value	(55)		(25)
Stock options exercised	$ 5,738	$ 10,901	$ 5,617
Stock Options | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)	215,724	620,646	341,063
Stock options forfeitures, Shares			0
Share-based compensation expense	$ 0	$ 0	$ 0
Stock compensation awards forfeited, Value	0		0
Stock options exercised	$ 2,835	$ 7,564	$ 6,859
Performance Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock forfeitures (in shares)	0		0
Performance stock issued (in shares)	0	0	0
Share-based compensation expense	$ 6,186	$ 6,687	$ 3,324
Stock compensation awards forfeited, Value	(385)		(28)
Performance stock issued	$ (523)	$ (866)	$ (371)
Performance Stock | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock forfeitures (in shares)	0		0
Performance stock issued (in shares)	41,660	72,504	31,093
Share-based compensation expense	$ 0	$ 0	$ 0
Stock compensation awards forfeited, Value	0		0
Performance stock issued	$ (523)	$ (866)	$ (371)
Employee Stock Purchase Plan | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee Stock Purchase Plan, Shares	0	0	0
Employee Stock Purchase Plan, Value	$ 478	$ 445	$ 458
Employee Stock Purchase Plan | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee Stock Purchase Plan, Shares	7,725	7,127	9,500
Employee Stock Purchase Plan, Value	$ 78	$ 87	$ 113
Stock Compensation Plan | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares purchased (in shares)	0	0	0
Treasury shares purchased for stock compensation programs	$ 0	$ 0	$ 0
Stock Compensation Plan | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares purchased (in shares)	(53,915)	(79,094)	(44,588)
Treasury shares purchased for stock compensation programs	$ (4,824)	$ (5,732)	$ (1,881)
Share Repurchase Program, May 2015 | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares purchased (in shares)		0
Treasury shares purchased for stock compensation programs		$ 0
Share Repurchase Program, May 2015 | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares purchased (in shares)		(168,941)
Treasury shares purchased for stock compensation programs		$ (11,781)
Share Repurchase Program, May 2015 | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares purchased (in shares)		(168,941)
Share Repurchase Program, May 2015 | Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares purchased (in shares)	0		0

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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