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Commitments and Contingencies - Additional Information (Detail) (USD $)
Share data in Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 0 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
First Republic Bank [Member]
Jun. 30, 2014
First Republic Bank [Member]
Dec. 31, 2013
First Republic Bank [Member]
Jun. 30, 2014
Protego [Member]
Jun. 30, 2014
Private Equity Funds [Member]
Dec. 31, 2013
Private Equity Funds [Member]
Jun. 30, 2014
Private Equity Funds [Member]
Discovery Fund [Member]
Dec. 31, 2013
Private Equity Funds [Member]
Discovery Fund [Member]
Jun. 30, 2014
Private Equity Funds [Member]
Discovery Fund [Member]
Protego [Member]
Apr. 30, 2014
EWM [Member]
May 22, 2014
EWM [Member]
Aug. 03, 2014
Subsequent Event [Member]
Aug. 03, 2014
Subsequent Event [Member]
Institutional Equities [Member]
Aug. 03, 2014
Subsequent Event [Member]
Class E LP Units [Member]
Aug. 03, 2014
Subsequent Event [Member]
Class G And H LP Units [Member]
Commitment And Contingencies [Line Items]                                          
Operating lease agreements expiration date       Various dates through 2023                                  
Rental expense relating to operating leases $ 6,895,000   $ 5,981,000 $ 13,279,000 $ 11,891,000                                
Operating Leases, Rent Expense, Minimum Rentals   2,000,000                                      
Unfunded commitments for capital contributions 9,882,000     9,882,000                                  
Percentage of the return proceeds received payable (as a percent)                   90.00%                      
Goodwill                             2,243,000            
Investment in private equity funds 77,577,000     77,577,000   67,560,000         34,241,000 32,379,000 2,545,000 5,015,000 2,545,000            
Maximum borrowing capacity                 25,000,000                        
Line of Credit Facility, Initiation Date               Jun. 24, 2014                          
Line of Credit Facility, Expiration Date               Jun. 27, 2015                          
Amount outstanding during period             25,000,000                            
Commitment to purchase noncontrolling interest (in shares)                               3          
Commitment to purchase noncontrolling interest (as a percent)                               22.00%     40.00%    
Purchase of interest by parent                               7,100,000          
Ownership Parent (as a percent)                                 62.00%        
Business Acquisitions Contingent Consideration Potential Cash Payment                                   $ 8,000,000      
Grant Of LP Units (in units)                               11       2,601 5,463