Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended						12 Months Ended							12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Commitments [Member]	Dec. 31, 2013 Trilantic [Member]	Dec. 31, 2013 EGL [Member]	Dec. 31, 2013 Office Equipment [Member]	Dec. 31, 2012 Office Equipment [Member]	Dec. 31, 2011 Office Equipment [Member]	Dec. 31, 2013 Letter of Credit [Member]	Dec. 31, 2012 Letter of Credit [Member]	Dec. 31, 2013 First Republic Bank [Member]	Jun. 27, 2013 First Republic Bank [Member]	Dec. 31, 2013 Protego [Member]	Dec. 31, 2013 Private Equity Funds [Member]	Dec. 31, 2012 Private Equity Funds [Member]	Dec. 31, 2013 Private Equity Funds [Member] Discovery Fund [Member]	Dec. 31, 2012 Private Equity Funds [Member] Discovery Fund [Member]	Dec. 31, 2013 Private Equity Funds [Member] Discovery Fund [Member] Protego [Member]	Feb. 05, 2014 Subsequent Event [Member] First Republic Bank [Member]
Commitment And Contingencies [Line Items]
Operating lease agreements expiration date	Various dates through 2023
Rental expense relating to operating leases	$ 23,905,000	$ 22,714,000	$ 16,136,000				$ 1,049,000	$ 627,000	$ 510,000
Other Assets	23,190,000	14,067,000								3,660,000	3,500,000
Unfunded commitments for capital contributions	9,945,000				4,265,000
Line of credit intra-day facility	11,481,000
Basis points	0.10%
Contractual obligations related to the Tax Receivable Agreements				184,643,000
Payment to the counterparties to the Tax Receivable Agreement, within one year or less				8,872,000
Payment to the counterparties to the Tax Receivable Agreement, one to three years				29,928,000
Payment to the counterparties to the Tax Receivable Agreement, three to five years				33,330,000
Payment to the counterparties to the Tax Receivable Agreement, after five years				112,513,000
Minimum commitment in member's equity fund						50,000,000
Percentage of the return proceeds received payable (as a percent)														90.00%
Investment in private equity funds	67,560,000	69,320,000													32,379,000	26,578,000	5,015,000	3,060,000	5,015,000
Maximum borrowing capacity													25,000,000
Amount outstanding												$ 0								$ 25,000,000