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Supplemental Financial Information - Quarterly Results (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 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, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 68,907 | $ 67,718 | $ 66,293 | $ 65,485 | $ 67,867 | $ 72,570 | $ 74,775 | $ 58,904 |  | $ 268,403 |  | $ 274,116 |  | $ 228,295
Operating income | 14,809 | 16,131 | 11,911 | 10,683 | 11,819 | 21,708 | 14,531 | 13,221 |  | 53,534 |  | 61,279 |  | 49,088
(Loss)/income before income taxes | (22,355) | 8,635 | 6,066 | 7,775 | (12,597) | 27,530 | 22,184 | 13,922 |  | 121 |  | 51,039 |  | 58,192
Net (loss)/income | $ (25,880) | $ 4,152 | $ 2,479 | $ 8,824 | $ (11,564) | $ 22,049 | $ 16,724 | $ 9,424 |  | $ (10,425) |  | $ 36,633 |  | $ 27,199
(Loss)/earnings per share - basic | $ (0.17) | $ 0.02 | $ 0.01 | $ 0.05 | $ (0.08) | $ 0.13 | $ 0.10 | $ 0.07 |  | $ (0.08) |  | $ 0.23 |  | $ 0.20
(Loss)/earnings per share - diluted | (0.17) | 0.02 | 0.01 | 0.05 | (0.08) | 0.13 | 0.10 | 0.07 |  | (0.08) |  | 0.23 |  | 0.20
Dividends per common share | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 |  | $ 0.12 |  | $ 0.12 |  | $ 0.32
(Loss)/gain on revaluation of deferred consideration (Note 12) | $ (5,354) | $ (6,306) | $ (4,037) | $ 4,404 | $ (5,410) | $ 7,732 | $ 9,898 |  | $ 12,220 | $ (11,293) | [1] | $ 12,220 | [1] |
Impairments (Note 26) | $ (30,138) | $ 0 | $ 0 | $ (572) | $ (17,386) |  |  |  |  | $ (30,710) |  | $ (17,386) |  |
[1] | (Losses)/gains arise due to increases/(decreases) in the forward-looking price of gold and the magnitude of any gain or loss is highly correlated to the magnitude of the change in the forward-looking price of gold. See Note 5 for a reconciliation of changes in the deferred consideration balances

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