Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Payables And Accruals [Abstract]
Employee benefits	$ 6,147	$ 8,278
Professional fees	579	951
Payables to affiliates	76	659
Other	1,711	1,633
Total	$ 8,513	$ 11,521