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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Basic And Diluted Earnings Per Share [Abstract]        
Net income (loss) $ 25,636 $ (58) $ 25,748 $ 2,749
(Income) loss allocated to non-controlling interests (1,621) 2 (1,629) 2
Net income (loss) allocable to common shares $ 24,015 $ (56) $ 24,119 $ 2,751
Weighted-average shares outstanding—Basic 33,962,015 24,011,540 32,516,470 19,004,591
Weighted-average shares outstanding—Diluted 33,962,015 24,011,540 32,520,684 19,040,301
Basic $ 0.71 $ 0.00 $ 0.74 $ 0.14
Diluted $ 0.71 $ 0.00 $ 0.74 $ 0.14