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Income Per Common Share - Computations of Basic and Diluted Income Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net income $ 28,171 $ 19,178 $ 143,983 $ (75,610) $ 52,962 $ (53,836) $ 55,676 $ (41,800) $ 115,722 $ 13,002 $ 58,026
Participating basic earnings                 (1,975) [1] (460) [1] (1,037) [1]
Basic income attributed to common shareholders                 113,747 12,542 56,989
Reallocation of participating earnings                 9 [1]   5 [1]
Diluted income attributed to common shareholders                 113,756 12,542 56,994
Income per common share:                      
Basic $ 0.17 $ 0.12 $ 0.88 $ (0.47) $ 0.33 $ (0.34) $ 0.34 $ (0.26) $ 0.71 $ 0.08 $ 0.36
Diluted $ 0.17 $ 0.12 $ 0.88 $ (0.47) $ 0.32 $ (0.34) $ 0.34 $ (0.26) $ 0.70 $ 0.08 $ 0.36
Continuing operations
                      
Net income                 115,722 13,002 42,706
Participating basic earnings                 (1,975) [1] (460) [1] (763) [1]
Basic income attributed to common shareholders                 113,747 12,542 41,943
Reallocation of participating earnings                 9 [1]   3 [1]
Diluted income attributed to common shareholders                 113,756 12,542 41,946
Income per common share:                      
Basic                 $ 0.71 $ 0.08 $ 0.26
Diluted                 $ 0.70 $ 0.08 $ 0.26
Discontinued operations
                      
Net income                     15,320
Participating basic earnings                     (274) [1]
Basic income attributed to common shareholders                     15,046
Reallocation of participating earnings                     2 [1]
Diluted income attributed to common shareholders                     $ 15,048
Income per common share:                      
Basic                     $ 0.10
Diluted                     $ 0.10
[1] Restricted stock Liability Awards represent participating securities because they participate in nonforfeitable dividends or distributions with common equity owners. Income allocable to participating securities represents the distributed and undistributed earnings attributable to the participating securities. Participating securities, however, do not participate in undistributed net losses.