Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (EPS) - Summary of Earnings Per Share (EPS) (Detail)

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Earnings Per Share (EPS) - Summary of Earnings Per Share (EPS) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Net income $ 7,970 $ 10,936 $ 16,843 $ 57,411
Basic EPS (in shares) 119,990,196 118,109,214 119,443,260 117,458,365
Basic EPS (in dollars per share) $ 0.07 $ 0.09 $ 0.14 $ 0.49
Stock options and restricted stock (in shares) 1,684,395 1,091,805 2,250,521 1,351,830
Stock options and restricted stock (in dollars per share)   $ 0.00   $ (0.01)
Stock options and restricted stock (in dollars per share) $ 0.00   $ 0.00  
Diluted EPS (in shares) 121,674,591 119,201,019 121,693,781 118,810,195
Diluted EPS (in dollars per share) $ 0.07 $ 0.09 $ 0.14 $ 0.48