Fair Values - Schedule of Range of Key Assumptions for Each Type of Loans Receivable (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Book Value	$ 19,000	$ 40,700
Hotel [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recovery Percentage	100.00%
Book Value	15,000	15,000
Office [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recovery Percentage	100.00%
Book Value	$ 4,000	$ 25,700