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Commitments and Contingencies - Additional Information (Detail) (USD $)
Share data in Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
First Republic Bank [Member]
Dec. 31, 2013
First Republic Bank [Member]
Mar. 31, 2014
Protego [Member]
Mar. 31, 2014
Private Equity Funds [Member]
Dec. 31, 2013
Private Equity Funds [Member]
Mar. 31, 2014
Private Equity Funds [Member]
Discovery Fund [Member]
Dec. 31, 2013
Private Equity Funds [Member]
Discovery Fund [Member]
Mar. 31, 2014
Private Equity Funds [Member]
Discovery Fund [Member]
Protego [Member]
Apr. 22, 2014
Subsequent Event [Member]
First Republic Bank [Member]
Apr. 30, 2014
EWM [Member]
Subsequent Event [Member]
Commitment And Contingencies [Line Items]                          
Operating lease agreements expiration date Various dates through 2023                        
Rental expense relating to operating leases $ 6,384,000 $ 5,910,000                      
Operating Leases, Rent Expense, Minimum Rentals 2,000,000                        
Unfunded commitments for capital contributions 9,880,000                        
Percentage of the return proceeds received payable (as a percent)           90.00%              
Goodwill                     817,000    
Investment in private equity funds 60,966,000   67,560,000       31,703,000 32,379,000 3,222,000 5,015,000 3,222,000    
Maximum borrowing capacity         25,000,000                
Line of Credit Facility, Expiration Date       Jun. 27, 2014                  
Amount outstanding                       25,000,000  
Commitment to purchase noncontrolling interest (in shares)                         3
Commitment to purchase noncontrolling interest (as a percent)                         22.00%
Purchase of interest by parent                         $ 7,100,000
Ownership Parent (as a percent)                         62.00%