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Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Net income (loss) $ 14,729 $ 4,836 $ 3,545 $ 3,500 $ 6,519 $ 1,156 $ 19,521 $ 4,245 $ 26,610 $ 31,441 $ (9,555)
(Income) loss allocated to non-controlling interests                 (322) (1,235) (246)
Net income (loss) allocable to common shares                 $ 26,288 $ 30,206 $ (9,801)
Weighted-average shares outstanding—Basic                 87,086,585 73,338,219 52,182,427
Dilutive securities                 290,406 261,650  
Weighted-average shares outstanding—Diluted                 87,376,991 73,599,869 52,182,427
Earnings (loss) per share—Basic $ 0.16 [1] $ 0.05 [1] $ 0.04 [1] $ 0.04 [1] $ 0.08 [1] $ 0.02 [1] $ 0.27 [1] $ 0.06 [1] $ 0.30 $ 0.41 $ (0.19)
Earnings (loss) per share—Diluted $ 0.16 [1] $ 0.05 [1] $ 0.04 [1] $ 0.04 [1] $ 0.08 [1] $ 0.02 [1] $ 0.27 [1] $ 0.06 [1] $ 0.30 $ 0.41 $ (0.19)
[1] The summation of quarterly per share amounts may not equal the full year amounts due to rounding.