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Investments - Additional Information (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2017
USD ($)
Jan. 31, 2016
USD ($)
Dec. 31, 2012
USD ($)
shares
Sep. 30, 2017
USD ($)
collateralized_loan_obligation
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
collateralized_loan_obligation
Sep. 30, 2016
USD ($)
Jan. 01, 2021
USD ($)
Feb. 01, 2020
USD ($)
Feb. 01, 2019
USD ($)
Feb. 01, 2018
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]                        
Percentage of carried interest income to be allocated to Partnership for future interests in future carry funds (percent) 47.50%                      
Amount of cash for strategic investment contingent consideration   $ 63,000,000                    
Amount of promissory note for strategic investment contingent consideration   $ 120,000,000                    
Length of term in years of promissory note to Barclays (in years)   6 years                    
Vesting period of common units to be issued to equity investment owner in future period           42 months            
Partnership's basis difference based on underlying net assets       $ 23,400,000   $ 23,400,000           $ 29,800,000
Basis difference amortization period (in years)           10 years            
Amount of accelerated expense recognized in the current period as a result of the March 2017 amendments to the original NGP agreements       $ 10,600,000 $ 4,100,000 $ 46,200,000 $ 10,700,000          
Number of CLOs formed during the period | collateralized_loan_obligation       5   5            
Number of CLOs consolidated during the period | collateralized_loan_obligation           1            
Total Assets of CLO consolidated during the period       $ 522,700,000   $ 522,700,000            
Minimum percent of aggregate assets for individual investments with fair value (percent)           5.00%            
Corporate mezzanine securities and bonds                        
Schedule of Equity Method Investments [Line Items]                        
Investments in CLOs and other       $ 323,200,000   $ 323,200,000           $ 156,100,000
Accelerated Expense                        
Schedule of Equity Method Investments [Line Items]                        
Amount of accelerated expense recognized in the current period as a result of the March 2017 amendments to the original NGP agreements           $ 27,700,000            
Barclays Natural Resource Investments                        
Schedule of Equity Method Investments [Line Items]                        
Contingent consideration   $ 183,000,000.0                    
Carlyle Holdings                        
Schedule of Equity Method Investments [Line Items]                        
Issuance of partnership units (in shares) | shares     597,944                  
Value of additional partnership units to be issued upon the satisfaction of certain performance conditions     $ 15,000,000                  
ECM Capital, L.P.                        
Schedule of Equity Method Investments [Line Items]                        
Contingent consideration     45,000,000.0                  
Portion of cash contingent consideration paid to equity investment owner in current period $ 22,500,000                      
ECM Capital, L.P. | Barclays Natural Resource Investments                        
Schedule of Equity Method Investments [Line Items]                        
Purchase price     $ 504,600,000                  
Issuance of partnership units (in shares) | shares     996,572                  
Management fee-related revenues                        
Schedule of Equity Method Investments [Line Items]                        
Percentage of management fee revenue allocated to Carlyle (percent) 55.00%                      
Scenario, Forecast                        
Schedule of Equity Method Investments [Line Items]                        
Value of common units to be issued to equity investment owner in future period (maximum)               $ 10,000,000.0 $ 10,000,000 $ 10,000,000 $ 10,000,000.0