Loans Receivable - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 SecurityLoan	Dec. 31, 2013 SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net book value of loans in maturity default			$ 27,000,000
Number of loans in maturity default			1
Reserve for loan losses		0	0
Mortgage Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan loss reserve	0
Material interest receivable			0
Subordinate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan impairments or loans in maturity	0
Loss reserves on loans			100.00%
Number of Loans		2	5
Subordinate Loans [Member] | Mortgage Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans			1
Subordinate Loans [Member] | Delinquent [Member] | Contractual Payments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross book value			$ 10,500,000