Loans Receivable - Loans Receivable by Internal Credit Rating (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014 SecurityLoan	Dec. 31, 2013 SecurityLoan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	9	13
Carrying Value of Loans Receivable	$ 48,667	$ 101,100
Greater than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	7	11
Carrying Value of Loans Receivable	36,321	90,773
Equal to Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	1	1
Carrying Value of Loans Receivable	12,346	10,327
Less than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	1	1
Carrying Value of Loans Receivable