Quarterly report pursuant to Section 13 or 15(d)

Schedule of Calculation of Basic Earnings Per Common Share (Detail)

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Schedule of Calculation of Basic Earnings Per Common Share (Detail) (USD $)
In Thousands, except Per 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 Basic [Line Items]        
Net income $ 14,194 $ (1,471) $ 63,208 $ 55,315
Less portion allocated to nonvested shares 159 90 713 1,128
Net income (loss) allocated to common shares $ 14,035 $ (1,561) $ 62,495 $ 54,187
Weighted average common shares outstanding 75,233 74,327 75,221 74,315
Basic and diluted earnings (loss) per common share $ 0.19 $ (0.02) $ 0.83 $ 0.73
Shares excluded due to being anti-dilutive (weighted-average) 851 1,866 860 1,823