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Net Income (Loss) per Share - Earnings Attributable to Common Shareholders and Weighted Average Common Shares Outstanding (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Continuing operations                      
Consolidated net income (loss)                 $ 77,044 $ (26,241) $ 36,697
Less: Net (income) attributable to noncontrolling interest                 (1,531) (676) (505)
Earnings (loss) available for diluted earnings per share                 75,513 (26,917) 36,192
Less: Undistributed net income from continuing operations allocated to participating securities                 (13,493) 0 (6,586)
Earnings (loss) from continuing operations available to common shareholders for basic earnings per share                 62,020 (26,917) 29,606
Discontinued operations                      
Net income (loss) from discontinued operations available for diluted earnings per share $ 563 $ (7,164) $ (2,048) $ (8,216) $ (39,482) $ (106,937) $ (36,992) $ (2,719) (16,865) (186,130) (19,609)
Less: Undistributed net income from discontinued operations allocated to participating securities                 3,014 0 3,569
Earnings (loss) from discontinued operations available to common shareholders for basic earnings per share                 $ (13,851) $ (186,130) $ (16,040)
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]                      
Weighted average common shares outstanding - basic                 34,546 34,266 35,317
Weighted average common shares upon conversion of participating securities                 7,515 0 7,857
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements                 273 0 422
Weighted average common shares outstanding - diluted                 42,334 34,266 43,596
Anti-dilutive awards excluded from diluted weighted average shares outstanding                 2,102 10,864 2,238