Property and Equipment - Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 15,163	$ 14,316
Less: Accumulated depreciation	(11,651)	(9,660)
Property and equipment, net	3,512	4,656
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,736	9,008
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,999	4,880
Capitalized Leases [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	238	238
Aircraft [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 190	$ 190