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Earnings Per Share - Earnings Per Share (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basic                      
Net income attributable to common shares $ 5,163,000 $ 3,453,000 $ 4,016,000 $ 4,400,000 $ 3,049,000 $ 2,616,000 $ 3,288,000 $ 2,552,000 $ 17,033,000 $ 11,505,000 $ 36,142,000
Weighted average common shares outstanding                 8,710,677 8,625,198 8,602,845
Basic earnings per common share $ 0.59 $ 0.40 $ 0.46 $ 0.51 $ 0.35 $ 0.30 $ 0.38 $ 0.30 $ 1.96 $ 1.33 $ 4.20
Diluted                      
Net income attributable to common shares                 $ 17,033,000 $ 11,505,000 $ 36,142,000
Weighted average common shares outstanding for basic earnings per common share                 8,710,677 8,625,198 8,602,845
Add: Dilutive effects of share-based awards                 14,031 224,429 275,335
Average shares and dilutive potential common shares                 8,724,708 8,849,627 8,878,180
Diluted earnings per common share $ 0.59 $ 0.40 $ 0.46 $ 0.50 $ 0.35 $ 0.30 $ 0.36 $ 0.28 $ 1.95 $ 1.30 $ 4.07