Quarterly report pursuant to Section 13 or 15(d)

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

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Schedule of Calculation of Basic and Diluted Earnings Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share Basic and Diluted    
Net income $ 11,189 $ 26,618
Less portion allocated to nonvested shares 120 281
Net income allocated to common shares $ 11,069 $ 26,337
Weighted-average common shares outstanding 75,556 75,206
Basic and diluted earnings per common share $ 0.15 $ 0.35
Shares excluded as anti-dilutive (weighted-average)   870