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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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