Build-to-Suit Lease Obligation - Schedule of Expected Reductions (Increases) in Build-to-Suit Lease Obligation (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Leases [Abstract]
Build-to-Suit Lease Obligation, Remainder of 2014	$ 135
Build-to-Suit Lease Obligation, 2015	632
Build-to-Suit Lease Obligation, 2016	(14)
Build-to-Suit Lease Obligation, 2017	64
Build-to-Suit Lease Obligation, 2018	148
Build-to-Suit Lease Obligation, 2019 and thereafter	18,065
Total minimum lease payments	$ 19,030