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Quarterly Financial Data (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
Income Statement [Abstract]                      
Total revenue $ 39,709 $ 25,492 $ 22,718 $ 21,657 $ 16,349 $ 13,049 $ 11,641 $ 8,132 $ 109,576 $ 49,171 $ 19,943
Net income (loss) 4,408 25,636 353 (241) 195 (58) (128) 2,935 $ 30,156 $ 2,944 $ 1,274
Net income (loss) allocable to common shares $ 4,123 $ 24,015 $ 337 $ (233) $ 189 $ (56) $ (128) $ 2,935      
Total earnings (loss) per share—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
Total earnings (loss) per share—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.