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Earnings Per Share - Computation of Pro Forma Basic and Diluted Net Income Per Share (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Unaudited pro forma numerator:      
Net income attributable to the Company $ 20,945,000 $ 5,663,000 $ 601,000
Unaudited pro forma additional income tax benefit 0 0 (137,000)
Unaudited pro forma net income $ 20,945,000 $ 5,663,000 $ 738,000
Unaudited pro forma denominator:      
Unaudited pro forma weighted average shares outstanding     44,560,053
Adjustment for vested restricted stock     916,842
Pro forma shares for calculating basic EPS 56,495,170 49,784,154 45,476,895
Unaudited pro forma weighted average shares outstanding     44,560,053
Adjustment for vested restricted stock     916,842
Effect of dilutive restricted stock 1,424,530 2,073,155 2,585,180
Pro forma shares for calculating diluted EPS 57,919,700 51,857,309 48,062,075
Unaudited pro forma weighted average shares outstanding:      
Basic $ 0.37 $ 0.11 $ 0.02
Diluted $ 0.36 $ 0.11 $ 0.02