Furniture, Equipment, and Leasehold Improvements, Net - Schedule of Furniture, Equipment, and Leasehold Improvements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]
Furniture, Equipment, and Leasehold Improvements, Gross	$ 7,014	$ 15,361
Accumulated amortization and depreciation	(4,741)	(11,988)
Furniture, equipment, and leasehold improvements, net	2,273	3,373
Furniture and equipment [Member]
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 to 5 Years
Furniture, Equipment, and Leasehold Improvements, Gross	2,549	5,563
Leasehold improvements [Member]
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 to 10 Years
Furniture, Equipment, and Leasehold Improvements, Gross	$ 4,465	$ 9,798