Annual report pursuant to Section 13 and 15(d)

Reconciliation of Income and Number of Shares Used to Calculate Basic and Diluted Earnings per Share (EPS) - Summary of Reconciliation of Income and Number of Shares Used to Calculate Basic and Diluted Earnings per Share (EPS) (Detail)

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Reconciliation of Income and Number of Shares Used to Calculate Basic and Diluted Earnings per Share (EPS) - Summary of Reconciliation of Income and Number of Shares Used to Calculate Basic and Diluted Earnings per Share (EPS) (Detail) (USD $)
In Thousands, except 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
Earnings Per Share [Abstract]                      
EPS, income $ 10,172 $ 7,970 $ 8,281 $ 592 $ (20,098) $ 10,936 $ 20,083 $ 26,392 $ 27,015 $ 37,313 $ (50,451)
Basic EPS, shares                 119,284,468 117,721,135 116,081,590
Basic earnings per share: $ 0.08 $ 0.07 $ 0.07 $ 0.00 $ (0.17) $ 0.09 $ 0.17 $ 0.23 $ 0.23 $ 0.32 $ (0.43)
Stock options and restricted stock, shares                 1,940,082 1,372,455 0
Stock options and restricted stock, per share amount $ (0.01)       $ (0.01)       $ (0.01) $ (0.01) $ 0.00
Diluted EPS, shares                 121,224,550 119,093,590 116,081,590
Diluted earnings per share: $ 0.08 $ 0.07 $ 0.07 $ 0.00 $ (0.17) $ 0.09 $ 0.17 $ 0.22 $ 0.22 $ 0.31 $ (0.43)