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Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic And Diluted Earnings Per Share [Abstract]        
Net income (loss) $ 30,790 $ 353 $ 30,744 $ 112
(Income) loss allocated to non-controlling interests (1,803) (16) (1,832) (8)
Net income (loss) allocable to common shares $ 28,987 $ 337 $ 28,912 $ 104
Weighted-average shares outstanding—Basic 47,183,804 31,794,822 47,138,573 31,781,718
Weighted-average shares outstanding—Diluted 47,229,736 33,066,770 47,159,220 33,060,578
Basic $ 0.61 $ 0.01 $ 0.61  
Diluted $ 0.61 $ 0.01 $ 0.61