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Capital Stock - Summary of Common Stock Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | (37,372,474) |  |
Stock options exercised (in shares) | 341,063 | 64,752 | 190,743
Ending Balances (in shares) | (37,736,578) | (37,372,474) |
Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | (62,081,391) | (62,081,391) | (62,081,391)
Treasury shares purchased (in shares) | 0 | 0 | 0
Ending Balances (in shares) | (62,081,391) | (62,081,391) | (62,081,391)
Beginning Balances | $ (157,643) | $ (148,401) | $ (132,055)
Tax benefit related to stock plans | 478 | 597 | 2,573
Treasury shares purchased for stock compensation programs | 0 | 0 | 0
Ending Balances | $ (172,681) | $ (157,643) | $ (148,401)
Stock Compensation Trust |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | 0 | 0 | (303,668)
Treasury shares purchased (in shares) | 0 | 0 | 0
Ending Balances (in shares) | 0 | 0 | 0
Beginning Balances | $ 0 | $ 0 | $ (1,585)
Tax benefit related to stock plans | 0 | 0 | 0
Treasury shares purchased for stock compensation programs | 0 | 0 | 0
Ending Balances | $ 0 | $ 0 | $ 0
Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | (24,708,917) | (24,633,081) | (24,575,624)
Treasury shares purchased (in shares) | (40,429) | (59,056) | (107,096)
Ending Balances (in shares) | (24,344,813) | (24,708,917) | (24,633,081)
Beginning Balances | $ (293,318) | $ (284,805) | $ (279,772)
Tax benefit related to stock plans | 0 | 0 | 0
Treasury shares purchased for stock compensation programs | (1,881) | (2,781) | (5,654)
Ending Balances | $ (287,501) | $ (293,318) | (284,805)
Restricted Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock awards |  |  | $ (161)
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 | 0
Restricted stock awards | $ (355) | $ (404) | $ (538)
Share-based compensation expense | 3,604 | 3,461 | 4,372
Restricted stock forfeitures | $ (148) | $ (426) | $ (346)
Restricted Stock | Stock Compensation Trust |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock awards (in shares) | 0 | 0 | 72,291
Restricted stock forfeitures (in shares) | 0 | 0 | 0
Restricted stock awards | $ 0 | $ 0 | $ (377)
Share-based compensation expense | 0 | 0 | 0
Restricted stock forfeitures | $ 0 | $ 0 | $ 0
Restricted Stock | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock awards (in shares) | 29,836 | 34,624 | 13,936
Restricted stock forfeitures (in shares) | (2,800) | (18,468) | (4,078)
Restricted stock awards | $ (355) | $ (404) |
Share-based compensation expense | 0 | 0 | $ 0
Restricted stock forfeitures | $ 0 | $ 0 | $ 0
Stock Options | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock forfeitures (in shares) | 0 | 0 |
Stock options exercised (in shares) | 0 | 0 | 0
Share-based compensation expense | $ 2,484 | $ 2,572 | $ 2,355
Restricted stock forfeitures | (25) | (118) |
Stock options exercised | $ 5,617 | $ 1,714 | $ 5,678
Stock Options | Stock Compensation Trust |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock forfeitures (in shares) | 0 | 0 |
Stock options exercised (in shares) | 0 | 0 | 150,962
Share-based compensation expense | $ 0 | $ 0 | $ 0
Restricted stock forfeitures | 0 | 0 |
Stock options exercised | $ 0 | $ 0 | $ 788
Stock Options | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock forfeitures (in shares) | 0 | 0 |
Stock options exercised (in shares) | 336,904 | 52,708 | 39,781
Share-based compensation expense | $ 0 | $ 0 | $ 0
Restricted stock forfeitures | 0 | 0 |
Stock options exercised | $ 6,859 | $ 216 | $ 460
Performance Stock | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock forfeitures (in shares) | 0 | 0 | 0
Performance stock issued (in shares) | 0 | 0 | 0
Share-based compensation expense | $ 3,324 | $ 2,265 | $ 2,705
Restricted stock forfeitures | (28) | (155) | (33)
Performance stock issued | $ (371) | $ (616) | $ (420)
Performance Stock | Stock Compensation Trust |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock forfeitures (in shares) | 0 | 0 | 0
Performance stock issued (in shares) | 0 | 0 | 80,415
Share-based compensation expense | $ 0 | $ 0 | $ 0
Restricted stock forfeitures | 0 | 0 | 0
Performance stock issued | $ 0 | $ 0 | $ (420)
Performance Stock | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock forfeitures (in shares) | 0 | 0 | 0
Performance stock issued (in shares) | 31,093 | 52,839 | 0
Share-based compensation expense | $ 0 | $ 0 | $ 0
Restricted stock forfeitures | 0 | 0 | 0
Performance stock issued | $ (371) | $ (616) | $ 0
Employee Stock Purchase Plan | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Performance stock issued (in shares) | 0 | 0 |
Performance stock issued | $ (458) | $ (352) |
Employee Stock Purchase Plan | Stock Compensation Trust |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Performance stock issued (in shares) | 0 | 0 |
Performance stock issued | $ 0 | $ 0 |
Employee Stock Purchase Plan | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Performance stock issued (in shares) | 9,500 | 11,517 |
Performance stock issued | $ (113) | $ (136) |
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 |
Share Repurchase Program, May 2015 | Stock Compensation Trust |  |  |
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) |  | (150,000) |
Treasury shares purchased for stock compensation programs |  | $ (7,104) |

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