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Supplemental Financial Information - Quarterly Results (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
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 79,175 [1] $ 78,112 [1] $ 75,775 [1] $ 71,256 [1] $ 65,651 [1] $ 63,749 [1] $ 57,312 [1] $ 63,200 [1] $ 304,318 $ 249,912 $ 266,528
Operating income 22,563 24,203 23,685 18,607 12,907 14,744 11,797 15,634 89,058 55,082 53,534
Income/(loss) before income taxes 15,271 6,333 21,889 13,178 (11,297) 1,138 (14,054) (11,009) 56,671 (35,222) 121
Net income/(loss) $ 11,187 $ 5,833 $ 17,630 $ 15,147 $ (13,497) $ (270) $ (13,250) $ (8,638) $ 49,797 $ (35,655) $ (10,425)
Earnings/(loss) per share – basic $ 0.07 $ 0.04 $ 0.11 $ 0.09 $ (0.10) $ (0.01) $ (0.09) $ (0.06) $ 0.31 $ (0.25) $ (0.08)
Earnings/(loss) per share – diluted 0.07 0.04 0.11 0.09 (0.10) (0.01) (0.09) (0.06) 0.31 (0.25) (0.08)
Dividends per common share $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.12 $ 0.12 $ 0.12
(Loss)/gain on revaluation of deferred consideration (Note 12) $ (3,048) $ 1,737 $ 497 $ 2,832 $ (22,385) $ (8,870) $ (23,358) $ (2,208) $ 2,018 $ (56,821) $ (11,293)
Impairments (Note 25)   $ (15,853)   $ (303)   $ (3,080)   $ (19,672) (16,156) (22,752) $ (30,710)
Loss on extinguishment of debt (Note 11)             $ (2,387)   $ 0 $ (2,387)  
[1] Advisory fees previously reported have been revised due to an immaterial error correction. These revisions had no effect on previously reported net income. See Note 2 for additional information.