Loans Receivable - Loans Receivable by Internal Credit Rating (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014 SecurityLoan	Dec. 31, 2013 SecurityLoan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	7	13
Liquidation Value of Loans Receivable	$ 62,314
Carrying Value of Loans Receivable	62,314	101,100
Greater than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	5	11
Liquidation Value of Loans Receivable	27,977
Carrying Value of Loans Receivable		90,773
Equal to Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	1	1
Liquidation Value of Loans Receivable	34,337
Carrying Value of Loans Receivable		$ 10,327
Less than Zero [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	1	1