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Supplemental Financial Information - Quarterly Results (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 67,059 $ 64,640 $ 58,126 $ 63,874 $ 68,907 $ 67,718 $ 66,293 $ 65,485 $ 253,699 $ 268,403 $ 274,116
Operating income 12,907 14,744 11,797 15,634 14,809 16,131 11,911 10,683 55,082 53,534 61,279
(Loss)/income before income taxes (11,297) 1,138 (14,054) (11,009) (22,355) 8,635 6,066 7,775 (35,222) 121 51,039
Net (loss)/income $ (13,497) $ (270) $ (13,250) $ (8,638) $ (25,880) $ 4,152 $ 2,479 $ 8,824 $ (35,655) $ (10,425) $ 36,633
(Loss)/earnings per share—basic $ (0.10) $ (0.01) $ (0.09) $ (0.06) $ (0.17) $ 0.02 $ 0.01 $ 0.05 $ (0.25) $ (0.08) $ 0.23
(Loss)/earnings per share—diluted (0.10) (0.01) (0.09) (0.06) (0.17) 0.02 0.01 0.05 (0.25) (0.08) 0.23
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) $ (22,385) $ (8,870) $ (23,358) $ (2,208) $ (5,354) $ (6,306) $ (4,037) $ 4,404 $ (56,821) $ (11,293) $ 12,220
Impairments (Notes 27)   $ (3,080)   $ (19,672) $ (30,138)     $ (572) (22,752) $ (30,710) $ (17,386)
Loss on extinguishment of debt (Note13)     $ (2,387)           $ (2,387)