Loans Receivable - Activity Relating to Loans Receivable (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan originations	$ 1,385,729
Gross Book Value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	164,180
Loan originations	1,384,318
Deferred origination fees and expenses	(9,036)
Amortization of deferred fees and expenses	2,939
Additional fundings	1,411
Loan satisfactions	(120,500)
Participations sold	(17,903)
Partial loan repayments	(17,838)
Reclassification to loans held-for-sale	(6,601)
Balance	1,380,970
Provision for Loan Losses [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	(22,680)
Loan originations
Deferred origination fees and expenses
Amortization of deferred fees and expenses
Additional fundings
Loan satisfactions
Participations sold
Partial loan repayments
Reclassification to loans held-for-sale	4,601
Balance	(18,079)
Net Book Value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	141,500
Loan originations	1,384,318
Deferred origination fees and expenses	(9,036)
Amortization of deferred fees and expenses	2,939
Additional fundings	1,411
Loan satisfactions	(120,500)
Participations sold	(17,903)
Partial loan repayments	(17,838)
Reclassification to loans held-for-sale	(2,000)
Balance	$ 1,362,891