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Capital Stock - Summary of Common Stock Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | (37,736,578) |  |
Stock options exercised (in shares) | 620,646 | 341,063 | 64,752
Stock options forfeitures, Shares |  | (12,753) | (28,708)
Ending Balances (in shares) | (38,222,928) | (37,736,578) |
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 | $ (172,681) | $ (157,643) | $ (148,401)
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options |  | 478 | 597
Ending Balances | $ (194,953) | $ (172,681) | $ (157,643)
Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | (24,344,813) | (24,708,917) | (24,633,081)
Ending Balances (in shares) | (23,858,463) | (24,344,813) | (24,708,917)
Beginning Balances | $ (287,501) | $ (293,318) | $ (284,805)
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options |  | 0 | 0
Ending Balances | (296,081) | $ (287,501) | $ (293,318)
Noncontrolling Interest | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | 450 |  |
Noncontrolling Interest | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | $ 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 | 0
Restricted stock awards | $ 422 | $ 355 | $ 404
Share-based compensation expense | 4,746 | 3,604 | 3,461
Stock compensation awards forfeited, Value | $ (49) | $ (148) | $ (426)
Restricted Stock | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock awards (in shares) | 34,798 | 29,836 | 34,624
Restricted stock forfeitures (in shares) | (690) | (2,800) | (18,468)
Restricted stock awards | $ 422 | $ 355 | $ 404
Share-based compensation expense | 0 | 0 | 0
Stock compensation awards forfeited, Value | $ (6) | $ 0 | $ 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 | 0
Share-based compensation expense | $ 380 | $ 2,484 | $ 2,572
Stock compensation awards forfeited, Value |  | (25) | (118)
Stock options exercised | $ 10,901 | $ 5,617 | $ 1,714
Stock Options | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Stock options exercised (in shares) | 620,646 | 341,063 | 64,752
Stock options forfeitures, Shares |  | 0 | 0
Share-based compensation expense | $ 0 | $ 0 | $ 0
Stock compensation awards forfeited, Value |  | 0 | 0
Stock options exercised | $ 7,564 | $ 6,859 | $ 216
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 | $ 6,687 | $ 3,324 | $ 2,265
Stock compensation awards forfeited, Value |  | (28) | (155)
Performance stock issued | $ (866) | $ (371) | $ (616)
Performance Stock | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock forfeitures (in shares) |  | 0 | 0
Performance stock issued (in shares) | 72,504 | 31,093 | 52,839
Share-based compensation expense | $ 0 | $ 0 | $ 0
Stock compensation awards forfeited, Value |  | 0 | 0
Performance stock issued | $ (866) | $ (371) | $ (616)
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 | $ 445 | $ 458 | $ 352
Employee Stock Purchase Plan | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Employee Stock Purchase Plan, Shares | 7,127 | 9,500 | 11,517
Employee Stock Purchase Plan, Value | $ 87 | $ 113 | $ 136
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) | (79,094) | (44,588) | (71,100)
Treasury shares purchased for stock compensation programs | $ (5,732) | $ (1,881) | $ (2,781)
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) | (168,941) |  | (150,000)
Treasury shares purchased for stock compensation programs | $ (11,781) |  | $ (7,104)
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 | (150,000)

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