Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Loss Contingencies [Line Items]
Number of RMBS Trustees Filing Suit	3
Number of Cash Claim Payments by Ambac Assurance	2
Number of California Municipal Entities	5
Number of Olympic Club Actions	3
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 5,679,000
Operating Leases, Future Minimum Payments, Due in Two Years	533,000
Operating Leases, Future Minimum Payments, Due in Three Years	533,000
Operating Leases, Future Minimum Payments, Due in Four Years	533,000
Operating Leases, Future Minimum Payments, Due in Five Years	416,000
Operating Leases, Future Minimum Payments, Due Thereafter	324,000
Operating Leases, Future Minimum Payments Due	8,018,000
Gain (Loss) Related to Litigation Settlement	7,768,000
Ambac [Member]
Loss Contingencies [Line Items]
Premium Income Due From Summary Judgment	2,700
Ambac Assurance [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Expense	207
Loss Contingency, Damages Sought, Value	800,000
Litigation settlement amount	$ 7,760,000