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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share [Line Items]                      
EPS, income $ (20,098) $ 10,936 $ 20,083 $ 26,392 $ (90,176) $ 20,725 $ 14,173 $ 4,827 $ 37,313 $ (50,451) $ (14,461)
Basic EPS, shares                 117,721,135 116,081,590 114,258,965
Basic EPS $ (0.17) $ 0.09 $ 0.17 $ 0.23 $ (0.77) $ 0.18 $ 0.12 $ 0.04 $ 0.32 $ (0.43) $ (0.13)
Stock options and restricted stock, shares                 1,372,455    
Stock options and restricted stock, per share amount $ (0.01)               $ (0.01)    
Diluted EPS, shares                 119,093,590 116,081,590 114,258,965
Diluted EPS $ (0.17) $ 0.09 $ 0.17 $ 0.22 $ (0.77) $ 0.18 $ 0.12 $ 0.04 $ 0.31 $ (0.43) $ (0.13)