Property and Equipment - Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended			24 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 15,578	$ 22,654		$ 15,578
Less accumulated depreciation	(13,183)	(19,993)		(13,183)
Property and equipment, net	2,395	2,661		2,395
Depreciation expense	1,045	1,110	$ 2,181
Held for sale
Property Plant And Equipment [Line Items]
Property and equipment, net	272			272
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,258	2,988		2,258
Office furniture, fixtures and equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	12,046	18,024		$ 12,046
Office furniture, fixtures and equipment | Minimum
Property Plant And Equipment [Line Items]
Depreciable life				2 years
Office furniture, fixtures and equipment | Maximum
Property Plant And Equipment [Line Items]
Depreciable life				10 years
Equipment Under Capital Leases
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,274	$ 1,642		$ 1,274