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Capital Stock - Summary of Common Stock Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | (38,841,194) |  |
Stock options exercised (in shares) | 274,704 | 198,535 | 215,724
Stock options forfeitures, Shares |  | (95) | (4,721)
Ending Balances (in shares) | (39,067,902) | (38,841,194) |
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 | $ (229,127) | $ (211,806) | $ (194,953)
Ending Balances | $ (242,693) | $ (229,127) | $ (211,806)
Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | (23,240,197) | (23,554,868) | (23,858,463)
Ending Balances (in shares) | (23,013,489) | (23,240,197) | (23,554,868)
Beginning Balances | $ (303,566) | $ (296,390) | $ (296,081)
Ending Balances | $ (326,156) | $ (303,566) | $ (296,390)
Restricted Stock | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock awards (in shares) | 0 | 0 | 0
Restricted stock expense (in shares) | 0 | 0 | 0
Restricted stock forfeitures (in shares) | 0 | 0 | 0
Restricted stock awards | $ (773) | $ (1,253) | $ (1,079)
Share-based compensation expense | 7,065 | 7,397 | 6,504
Stock compensation awards forfeited, Value | $ (807) | $ (483) | $ (283)
Restricted Stock | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock awards (in shares) | 55,691 | 96,893 | 92,401
Restricted stock expense (in shares) | 0 | 0 | 0
Restricted stock forfeitures (in shares) | 0 | 0 | 0
Restricted stock awards | $ (773) | $ (1,253) | $ (1,079)
Share-based compensation expense | 0 | 0 | 0
Stock compensation awards forfeited, Value | $ 0 | $ 0 |
Stock Options | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock expense (in shares) | 0 | 0 |
Stock options exercised (in shares) | 0 | 0 | 0
Stock options forfeitures, Shares | 0 | 0 | 0
Share-based compensation expense | $ 153 | $ 492 | $ 272
Stock compensation awards forfeited, Value | (40) | (5) | (55)
Stock options exercised | $ 8,590 | $ 5,107 | $ 5,738
Stock Options | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock expense (in shares) | 0 | 0 | 0
Stock options exercised (in shares) | 274,672 | 193,681 | 215,724
Stock options forfeitures, Shares | 0 | 0 | 0
Share-based compensation expense | $ 0 | $ 0 | $ 0
Stock compensation awards forfeited, Value | 0 | 0 | 0
Stock options exercised | $ 3,856 | $ 2,364 | $ 2,835
Performance Stock | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock expense (in shares) | 0 | 0 | 0
Restricted stock forfeitures (in shares) | 0 | 0 |
Performance stock issued (in shares) | 0 | 0 | 0
Share-based compensation expense | $ 1,305 | $ 6,574 | $ 6,186
Stock compensation awards forfeited, Value | (755) | $ (215) | (385)
Stock Issued During Period, Shares, Acquisitions |  | 0 |
Performance stock issued | $ (1,826) | $ (1,778) | $ (523)
Stock Issued During Period, Value, Acquisitions |  | $ 921 |
Performance Stock | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock expense (in shares) | 0 | 0 | 0
Restricted stock forfeitures (in shares) | 0 | 0 | 0
Performance stock issued (in shares) | 134,824 | 139,478 | 41,660
Share-based compensation expense | $ 0 | $ 0 | $ 0
Stock compensation awards forfeited, Value | 0 | $ 0 | 0
Stock Issued During Period, Shares, Acquisitions |  | 0 |
Performance stock issued | $ (1,826) | $ (1,778) | $ (523)
Stock Issued During Period, Value, Acquisitions |  | $ 0 |
Employee Stock Purchase Plan | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Employee stock purchase plan (in shares) | 0 | 0 | 0
Employee stock purchase plan | $ 654 | $ 564 | $ 478
Employee Stock Purchase Plan | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Employee stock purchase plan (in shares) | 6,494 | 5,895 | 7,725
Employee stock purchase plan | $ 93 | $ 77 | $ 78
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) | (69,973) | (87,811) | (53,915)
Treasury shares purchased for stock compensation programs | $ (9,025) | $ (9,301) | $ (4,824)
Share Repurchase Program, May 2015 | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Treasury shares purchased (in shares) | 0 | 0 |
Treasury shares purchased for stock compensation programs | $ 0 | $ 0 |
Share Repurchase Program, May 2015 | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Treasury shares purchased (in shares) | (175,000) | (33,465) |
Treasury shares purchased for stock compensation programs | $ (20,113) | $ (3,347) |
Share Repurchase Program, May 2015 | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Treasury shares purchased (in shares) | (175,000) | (33,465) | 0

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