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Investments - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended
Mar. 31, 2017
Jan. 31, 2016
Dec. 31, 2012
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]            
Percentage of carried interest income to be allocated to Partnership for future interests in future carry funds     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        
Value of common units to be issued to equity investment owner in future period (maximum) $ 10,000,000.0     $ 10,000,000.0    
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 27,700,000     $ 27,700,000   $ 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       $ 26,000,000 $ 3,600,000  
Minimum percent of aggregate assets for individual investments with fair value       5.00%    
Corporate mezzanine securities and bonds            
Schedule of Equity Method Investments [Line Items]            
Investments in CLOs and other 159,400,000     $ 159,400,000   $ 156,100,000
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)     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)     996,572      
Management fee-related revenues            
Schedule of Equity Method Investments [Line Items]            
Percentage of management fee revenue allocated to Carlyle     55.00%      
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       $ 20,800,000