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Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]                      
Total revenue $ 51,428 $ 51,299 $ 50,956 $ 49,540 $ 49,809 $ 48,779 $ 46,889 $ 45,755 $ 203,223 $ 191,232 $ 161,216
Net income (loss) 24,020 4,912 14,856 2,566 14,729 4,836 3,545 3,500 46,354 26,610 31,441
Net income (loss) allocable to common shares $ 23,784 $ 4,863 $ 14,709 $ 2,540 $ 14,580 $ 4,787 $ 3,509 $ 3,412 $ 45,896 $ 26,288 $ 30,206
Total earnings (loss) per share—Basic $ 0.26 [1] $ 0.05 [1] $ 0.16 [1] $ 0.03 [1] $ 0.16 [1] $ 0.05 [1] $ 0.04 [1] $ 0.04 [1] $ 0.51 $ 0.30 $ 0.41
Total earnings (loss) per share—Diluted $ 0.26 [1] $ 0.05 [1] $ 0.16 [1] $ 0.03 [1] $ 0.16 [1] $ 0.05 [1] $ 0.04 [1] $ 0.04 [1] $ 0.51 $ 0.30 $ 0.41
[1] The summation of quarterly per share amounts may not equal the full year amounts due to rounding.