Quarterly report pursuant to Section 13 or 15(d)

Computation of Basic and Diluted Earnings (Loss) Per Share (Detail)

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Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Basic:        
Net income $ 4,279 $ 7,592 $ 7,066 $ 14,371
Less: Distributed loss/distributed and undistributed income (unvested restricted stock) 38 70 61 132
Net income attributable to common shareholders 4,241 7,522 7,005 14,239
Denominator for basic earnings per share-weighted-average shares 14,457 14,388 14,456 14,385
Basic earnings per share - common shareholders $ 0.30 $ 0.52 $ 0.49 $ 0.99
Diluted:        
Net income 4,279 7,592 7,066 14,371
Less: Distributed loss/distributed and undistributed income (unvested restricted stock) 38 70 61 132
Net income attributable to common shareholders $ 4,241 $ 7,522 $ 7,005 $ 14,239
Denominator for basic earnings per share-weighted-average shares 14,457 14,388 14,456 14,385
Effect of dilutive securities:        
Employee stock options 3 21 3 24
Denominator for dilutive earnings per share-weighted-average shares 14,460 14,409 14,459 14,409
Diluted earnings per share - common shareholders $ 0.30 $ 0.52 $ 0.49 $ 0.99