Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]
Deductions From Reserves	$ 0	$ 0	$ 0
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Fiscal Year	585	290	301
Charge to Costs and Expenses (Recovery of write-offs)	773	303	63
Deductions From Reserves	(477)	(8)	(74)
Balance at End of Fiscal Year	$ 881	$ 585	$ 290