Loans Receivable - Loans Receivable by Internal Credit Rating (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014 SecurityLoan	Dec. 31, 2013 SecurityLoan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	8	13
Carrying Value of Loans Receivable	$ 44,617	$ 101,100
Greater than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	6	11
Carrying Value of Loans Receivable	32,267	90,773
Equal to Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	1	1
Carrying Value of Loans Receivable	12,350	10,327
Less than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	1	1
Carrying Value of Loans Receivable	$ 0	$ 0