ACCRUED EXPENSES AND OTHER LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Compensation	$ 47,285	$ 22,766
Subcontractor costs	4,360	2,815
Professional fees	2,251	1,162
Facilities costs	1,538	757
Acquisition related deferred consideration	603	1,022
Other	4,347	3,681
Total	$ 60,384	$ 32,203