Provision for Income Tax Asset (Liability) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Income Tax [Line Items]
Net income tax receivable (payable)	$ (574)	$ (574)
State and Local Jurisdiction
Income Tax [Line Items]
Current income tax receivable (payable)	(287)	(287)
Deferred income tax receivable (payable)	1,512	1,512
Internal Revenue Service (IRS)
Income Tax [Line Items]
Current income tax receivable (payable)	(179)	(179)
Deferred income tax receivable (payable)	$ (1,620)	$ (1,620)