Build-to-Suit Lease Obligation - Schedule of Expected Reductions (Increases) in Build-to-Suit Lease Obligation (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Leases [Abstract]
Build-to-Suit Lease Obligation, 2016	$ (8)
Build-to-Suit Lease Obligation, 2017	58
Build-to-Suit Lease Obligation, 2018	130
Build-to-Suit Lease Obligation, 2019	208
Build-to-Suit Lease Obligation, 2020	292
Build-to-Suit Lease Obligation, 2021 and thereafter	16,726
Total minimum payments	$ 17,406