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v3.3.1.900

Capital Stock - Summary of Common Stock Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | 37,448,310 |  |
Stock options exercised (in shares) | 64,752 | 190,743 | 277,687
Ending Balances (in shares) | 37,372,474 | 37,448,310 |
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 | $ 148,401 | $ 132,055 | $ 112,135
Tax benefit related to stock plans | 596 | 2,573 | 2,246
Ending Balances | $ 157,642 | $ 148,401 | $ 132,055
Stock Compensation Trust |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | 0 | (303,668.000) | (745,430)
Ending Balances (in shares) | 0 | 0 | (303,668.000)
Beginning Balances | $ 0 | $ (1,585) | $ (3,891)
Ending Balances | $ 0 | $ 0 | $ (1,585)
Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balances (in shares) | (24,633,081) | (24,575,624) | (24,328,162)
Share repurchase program (in shares) | (150,000) |  |
Ending Balances (in shares) | (24,708,917) | (24,633,081) | (24,575,624)
Beginning Balances | $ (284,805) | $ (279,772) | $ (267,987)
Share repurchase program | (7,104) |  |
Ending Balances | (293,318) | (284,805) | (279,772)
Restricted Stock | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock awards | (404) | (538) | (505)
Share-based compensation expense | 3,461 | 4,372 | 4,244
Restricted stock forfeitures | $ (426) | $ (346) | $ (115)
Restricted Stock | Stock Compensation Trust |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock awards (in shares) |  | 72,291 | 96,686
Restricted stock awards |  | $ 377 | $ 505
Restricted Stock | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Restricted stock awards (in shares) | 34,624 | 13,936 |
Restricted stock forfeitures (in shares) | (18,468) | (4,078) | (7,365)
Restricted stock awards | $ 404 | $ 161 |
Stock Options | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Share-based compensation expense | 2,572 | 2,355 | $ 2,825
Stock options exercised | 1,714 | $ 5,678 | $ 8,194
Stock option forfeitures | $ (118) |  |
Stock Options | Stock Compensation Trust |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Stock options exercised (in shares) |  | 150,962 | 277,687
Stock options exercised |  | $ 788 | $ 1,449
Stock Options | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Stock options exercised (in shares) | 52,708 | 39,781 |
Stock options exercised | $ 216 | $ 460 |
Performance Stock | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Share-based compensation expense | 2,265 | 2,705 | 3,383
Performance stock issued | (616) | $ (420) | $ (352)
Performance stock forfeitures | $ (155) |  |
Performance Stock | Stock Compensation Trust |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Performance stock issued (in shares) |  | 80,415 | 67,389
Performance stock issued |  | $ 420 | $ 352
Performance Stock | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Performance stock issued (in shares) | 52,839 |  |
Performance stock issued | $ 616 |  |
Treasury | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Treasury shares purchased (in shares) | (59,056) | (107,096) | (240,097)
Treasury shares purchased for stock compensation programs | $ (2,781) | $ (5,654) | $ (11,785)
Employee Stock Purchase Plan | Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Performance stock issued | $ 352 |  |
Employee Stock Purchase Plan | Treasury |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Employee stock purchase plan (in shares) | 11,517 |  |
Performance stock issued | $ 136 |  |

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