Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Trilantic [Member]	Sep. 30, 2013 First Republic Bank [Member]	Jun. 27, 2013 First Republic Bank [Member]
Commitment And Contingencies [Line Items]
Operating Leases agreements, expiration date			Various dates through 2023
Rental expense relating to operating leases	$ 5,926,000	$ 5,992,000	$ 17,787,000	$ 17,339,000
Unfunded commitments for capital contributions	10,224,000		10,224,000		4,487,000
Line of credit facility, maximum borrowing capacity							25,000,000
Line of credit facility, amount outstanding						$ 0