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Discontinued Operations - Additional Information (Detail) - USD ($)
shares in Millions
1 Months Ended 12 Months Ended
Nov. 23, 2018
Nov. 23, 2018
Nov. 07, 2018
Sep. 05, 2018
Nov. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 19, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Net cash provided by (used in) operating activities from discontinued operations           $ 0 $ 0 $ (748,231,000)  
Net cash provided by (used in) investing activities from discontinued operations           0 0 18,347,000  
Revolving Credit Facility [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Repayments of outstanding borrowings     $ 150,000,000.0            
Intercompany Credit Agreement [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Line of credit facility, outstanding amount                 $ 150,000,000.0
Cantor [Member] | Revolving Credit Facility [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Line of credit facility, outstanding amount           $ 0 $ 0   $ 150,000,000.0
8.125% Senior Notes Due 2042 [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Stated interest rate           8.125%      
Debt maturity year           2042      
Repayments of outstanding borrowings       $ 112,500,000          
5.375% Senior Notes Due 2019 [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Stated interest rate           5.375%      
5.375% Senior Notes Due 2019 [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Stated interest rate 5.375% 5.375%              
Debt maturity year   2019       2019      
Repayments of outstanding borrowings $ 300,000,000.0                
Newmark [Member] | Intercompany Credit Agreement [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Repayments of outstanding borrowings     $ 150,000,000.0            
Newmark [Member] | 5.375% Senior Notes Due 2019 [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Repayments of outstanding borrowings   $ 300,000,000.0              
LPUs [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Number of limited partnership units granted exchangeability         8.4        
Newmark [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Net cash provided by (used in) operating activities from discontinued operations               (748,200,000)  
Net cash provided by (used in) investing activities from discontinued operations               18,300,000  
Income allocated to limited partnership units               37,000,000.0  
Interest expense recorded               46,100,000  
Newmark [Member] | Intercompany Credit Agreement [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Interest expense recorded               3,500,000  
Newmark [Member] | LPUs [Member]                  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                  
Number of limited partnership units granted exchangeability         3.9        
Equity-based compensation expense               $ 111,100,000