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Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition        
Additional goodwill recognized   $ 560,332 $ 557,914 $ 515,321
Business acquisition, aggregate revenue contribution   7,500    
HVS        
Business Acquisition        
Total consideration transferred $ 9,839 9,800    
Payments to acquire businesses, gross   $ 5,900    
Business acquisition, equity interest issued (in shares)   104,653    
Business acquisition, contingent non cash consideration, fair value   $ 1,300    
Contingent consideration cash   2,200    
Additional goodwill recognized $ 6,294 6,300    
Business acquisition, amount deductible for tax   2,400    
HVS | Restricted Stock Units (RSUs)        
Business Acquisition        
Shares issued as compensation   $ 400    
2019 Acquisitions        
Business Acquisition        
Total consideration transferred     56,893  
Contingent consideration cash     15,300  
Additional goodwill recognized     43,804  
Business acquisition, amount deductible for tax     29,700  
Business acquisition, aggregate revenue contribution     $ 18,400  
2019 Acquisitions | Newmark Holdings, L.P. | Limited Partnership Units        
Business Acquisition        
Business acquisition, equity interest issued (in shares)     327,692  
Business acquisition, contingent non cash consideration, fair value     $ 2,700