Property and Equipment Net (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Office equipment	$ 662	$ 3,071
Office equipment-capital leases	213	231
Leasehold improvements	1,496	3,015
Property and equipment, Gross	2,371	6,317
Accumulated depreciation and amortization	(567)	(4,267)
Total	$ 1,804	$ 2,050