Loans Receivable - Activity Relating to Loans Receivable (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan originations	$ 756,638
Gross Book Value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	164,180
Loan originations	756,638
Deferred origination fees and expenses	(3,776)
Amortization of deferred fees and expenses	239
Loan satisfactions	(62,500)
Partial loan repayments
Reclassification to loans held-for-sale	(6,601)
Balance	848,180
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
Loan satisfactions
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	756,638
Deferred origination fees and expenses	(3,776)
Amortization of deferred fees and expenses	239
Loan satisfactions	(62,500)
Partial loan repayments
Reclassification to loans held-for-sale	(2,000)
Balance	$ 830,101