Annual report pursuant to Section 13 and 15(d)

Capital Structure and Per Share Data - Dilutive Effect on Earnings Per Share (Detail)

v3.3.1.900
Capital Structure and Per Share Data - Dilutive Effect on Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Weighted Average Shares, Basic                 50,489 52,065 52,556
Weighted Average Shares, Stock compensation plans                 394 498 385
Weighted Average Shares, Diluted                 50,883 52,563 52,941
Income (Loss) From Continuing Operations, Amount                 $ 88,091 $ 98,559 $ 84,678
Income (Loss) From Continuing Operations, Basic, Amount                 88,055 98,248 84,077
Income (Loss) From Continuing Operations Diluted, Amount                 $ 88,055 $ 98,248 $ 84,077
Income (Loss) From Continuing Operations, Basic, Per Share Amount                 $ 1.74 $ 1.89 $ 1.60
Income (Loss) From Continuing Operations, Diluted, Per Share Amount                 $ 1.73 $ 1.87 $ 1.59
Dilutive effect on earnings per share                 $ (1,780) $ (1,342) $ (3,060)
Income (Loss) From Discontinued Operations, Basic earnings (loss), Amount                 (1,780) (1,342) (3,060)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Amount                 $ (1,780) $ (1,342) $ (3,060)
Income (Loss) From Discontinuing Operations, Basic earnings (loss), Per Share Amount                 $ (0.03) $ (0.03) $ (0.06)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Per Share Amount                 $ (0.03) $ (0.03) $ (0.06)
Net Income (Loss), Amount $ 31,058 $ 26,505 $ 14,781 $ 13,967 $ 26,126 $ 24,712 $ 26,993 $ 19,386 $ 86,311 $ 97,217 $ 81,618
Participating securities income (loss) from continuing operations non-vested restricted stock and restricted stock units                 (36) (311) (601)
Net Income (Loss), Basic, Amount                 86,275 96,906 81,017
Net Income (Loss), Diluted, Amount                 $ 86,275 $ 96,906 $ 81,017
Net Income (Loss), Basic, Per Share Amount $ 0.62 $ 0.53 $ 0.29 $ 0.27 $ 0.51 $ 0.47 $ 0.51 $ 0.37 $ 1.71 $ 1.86 $ 1.54
Net Income (Loss), Diluted, Per Share Amount $ 0.62 $ 0.52 $ 0.29 $ 0.27 $ 0.50 $ 0.47 $ 0.51 $ 0.36 $ 1.70 $ 1.84 $ 1.53