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Segment Reporting - Reportable Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Operating Revenues:        
Total revenues $ 67,718 $ 72,570 $ 199,496 $ 206,249
Total operating expenses (51,587) (50,862) (160,771) (156,789)
Other income/(expenses)        
Interest expense (2,832) (2,747) (8,634) (5,103)
Interest income 799 719 2,396 2,293
(Loss)/gain on revaluation of deferred consideration – gold payments [1] (6,306) 7,732 (5,939) 17,630
Impairment     572  
Other gains/(losses), net 843 118 (3,500) (644)
Income/(loss) before taxes 8,635 27,530 22,476 63,636
Advisory Fees [Member]        
Operating Revenues:        
Total revenues 67,006 71,679 197,473 203,913
U.S. Business segment [Member]        
Operating Revenues:        
Other income 81 173 263 482
Total revenues 42,031 50,389 127,800 159,147
Total operating expenses (33,477) (33,774) (107,060) (115,442)
Other income/(expenses)        
Interest expense (197) (196) (583) (369)
Interest income 793 719 2,390 2,293
Impairment     (572)  
Other gains/(losses), net 235 318 326 26
Other income/(expenses) 831 841 1,561 1,950
Income/(loss) before taxes 9,385 17,456 22,301 45,655
U.S. Business segment [Member] | Advisory Fees [Member]        
Operating Revenues:        
Total revenues 41,950 50,216 127,537 158,665
International Business Segment [Member]        
Operating Revenues:        
Other income 631 718 1,760 1,854
Total revenues 25,687 22,181 71,696 47,102
Total operating expenses (18,110) (17,088) (53,711) (41,347)
Other income/(expenses)        
Interest expense (2,635) (2,551) (8,051) (4,734)
Interest income 6   6  
(Loss)/gain on revaluation of deferred consideration – gold payments (6,306) 7,732 (5,939) 17,630
Other gains/(losses), net 608 (200) (3,826) (670)
Other income/(expenses) (8,327) 4,981 (17,810) 12,226
Income/(loss) before taxes (750) 10,074 175 17,981
International Business Segment [Member] | Advisory Fees [Member]        
Operating Revenues:        
Total revenues $ 25,056 $ 21,463 $ 69,936 $ 45,248
[1] Gains/(losses) arise due to (decreases)/increases 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.