Build-to-Suit Lease Obligation - Schedule of Expected Reductions in Build-to-Suit Lease Obligation (Detail) $ in Thousands	Jun. 30, 2015 USD ($)
Leases [Abstract]
Build-to-Suit Lease Obligation, Remainder of 2015	$ 197
Build-to-Suit Lease Obligation, 2016	10
Build-to-Suit Lease Obligation, 2017	77
Build-to-Suit Lease Obligation, 2018	149
Build-to-Suit Lease Obligation, 2019	228
Build-to-Suit Lease Obligation, 2020 and after	16,455
Total minimum payments	$ 17,116