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Earnings Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:                      
Net income $ 5,157 $ 3,847 $ 5,946 $ 5,995 $ 2,506 $ 2,690 $ (593) $ 1,060 $ 20,945 $ 5,663 $ 607
Less: net loss attributable to the noncontrolling interest                     (6)
Less: income allocable to participating securities                 (270)    
Income allocable to common shares                 20,675 5,663 601
Add back: undistributed earnings allocable to participating securities                 270    
Less: undistributed earnings reallocated to participating securities                 (264)    
Numerator for diluted earnings per share                 $ 20,681 $ 5,663 $ 601
Denominator:                      
Weighted average common shares outstanding                 50,315,455 49,002,809 44,560,053
Adjustment for vested restricted stock                 6,179,715 781,345 916,842
Shares for calculating basic EPS 57,109,987 57,050,684 57,038,021 54,749,951 52,018,730 51,056,462 50,284,362 45,721,584 56,495,170 49,784,154 45,476,895
Dilutive effect of unvested restricted stock                 1,424,530 2,073,155 2,585,180
Shares for calculating diluted EPS 58,365,587 58,367,830 58,369,083 56,562,661 53,855,629 52,978,051 50,284,362 48,371,169 57,919,700 51,857,309 48,062,075
Net income per share:                      
Basic $ 0.09 $ 0.07 $ 0.10 $ 0.11 $ 0.05 $ 0.05 $ (0.01) $ 0.02 $ 0.37 $ 0.11 $ 0.01
Diluted $ 0.09 $ 0.07 $ 0.10 $ 0.11 $ 0.05 $ 0.05 $ (0.01) $ 0.02 $ 0.36 $ 0.11 $ 0.01