Loans Receivable - Loans Receivable by Internal Credit Rating (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 SecurityLoan	Dec. 31, 2012 SecurityLoan	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Number of loans	13	18
Carrying Value of Loans Receivable	$ 101,100,000	$ 211,250,000	$ 114,333,000
Greater than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	11	18
Carrying Value of Loans Receivable	90,773,000	211,250,000
Equal to Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	1
Carrying Value of Loans Receivable	10,327,000
Less than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	1
Carrying Value of Loans Receivable
Whole Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	6	8
Carrying Value of Loans Receivable	64,534,000	160,288,000
Whole Loan [Member] | Greater than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	6	8
Carrying Value of Loans Receivable	64,534,000	160,288,000
Whole Loan [Member] | Equal to Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Carrying Value of Loans Receivable
Whole Loan [Member] | Less than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Carrying Value of Loans Receivable
B Note [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	4	5
Carrying Value of Loans Receivable	23,248,000	31,028,000
B Note [Member] | Greater than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	4	5
Carrying Value of Loans Receivable	23,248,000	31,028,000
B Note [Member] | Equal to Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Carrying Value of Loans Receivable
B Note [Member] | Less than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans
Carrying Value of Loans Receivable
Mezzanine [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	3	5
Carrying Value of Loans Receivable	13,318,000	19,934,000
Mezzanine [Member] | Greater than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	1	5
Carrying Value of Loans Receivable	2,991,000	19,934,000
Mezzanine [Member] | Equal to Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	1
Carrying Value of Loans Receivable	10,327,000
Mezzanine [Member] | Less than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of loans	1
Carrying Value of Loans Receivable