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Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Net income (loss) $ 2,407 $ 25,636 $ 33,151 $ 25,748
(Income) loss allocated to non-controlling interests (140) (1,621) (1,972) (1,629)
Net income (loss) allocable to common shares $ 2,267 $ 24,015 $ 31,179 $ 24,119
Weighted-average shares outstanding—Basic 47,215,918 33,962,015 47,164,543 32,516,470
Weighted-average shares outstanding—Diluted 47,314,629 33,962,015 47,190,139 32,520,684
Basic $ 0.05 $ 0.71 $ 0.66 $ 0.74
Diluted $ 0.05 $ 0.71 $ 0.66 $ 0.74