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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, 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
Basic And Diluted Earnings Per Share [Abstract]                      
Net income (loss) $ 4,408 $ 25,636 $ 353 $ (241) $ 195 $ (58) $ (128) $ 2,935 $ 30,156 $ 2,944 $ 1,274
(Income) loss allocated to preferred shares                     (10)
(Income) loss allocated to non-controlling interests                 (1,914) (4) (649)
Net income (loss) allocable to common shares                 $ 28,242 $ 2,940 $ 615
Weighted-average shares outstanding—Basic                 36,153,673 21,315,928 5,330,814
Dilutive securities                 6,601 216,743  
Weighted-average shares outstanding—Diluted                 36,160,274 21,532,671 5,330,814
Basic $ 0.09 [1] $ 0.71 [1] $ 0.01 [1] $ (0.01) [1] $ 0.01 [1] $ 0.00 [1] $ (0.01) [1] $ 0.19 [1] $ 0.78 $ 0.14 $ 0.12
Diluted $ 0.09 [1] $ 0.71 [1] $ 0.01 [1] $ (0.01) [1] $ 0.01 [1] $ 0.00 [1] $ (0.01) [1] $ 0.19 [1] $ 0.78 $ 0.14 $ 0.12
[1] The summation of quarterly per share amounts do not equal the full year amounts.