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Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]                      
Revenues $ 76,916 $ 60,780 $ 57,444 $ 55,112 $ 54,088 $ 54,200 $ 52,268 $ 51,350 $ 250,252 $ 211,906 $ 203,223
Net income (loss) 29,465 11,564 3,407 1,093 13,360 1,092 799 (374) 45,529 14,877 46,354
Net income (loss) allocable to common shares $ 28,615 $ 11,502 $ 3,386 $ 1,086 $ 13,261 $ 1,090 $ 789 $ (372) $ 44,589 $ 14,768 $ 45,896
Total earnings per share—Basic $ 0.23 [1] $ 0.11 [1] $ 0.03 [1] $ 0.01 [1] $ 0.14 [1] $ 0.01 [1] $ 0.01 [1] $ 0.00 [1] $ 0.41 $ 0.16 $ 0.51
Total earnings per share—Diluted $ 0.23 [1] $ 0.11 [1] $ 0.03 [1] $ 0.01 [1] $ 0.14 [1] $ 0.01 [1] $ 0.01 [1] $ 0.00 [1] $ 0.41 $ 0.16 $ 0.51
[1] The summation of quarterly per share amounts may not equal the full year amounts due to rounding.