Schedule II - Valuation and Qualifying Accounts and Reserves Supplemental Schedule (Detail) - Accounts Receivable Reserves - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 2,040	$ 2,028	$ 2,153
Charged to Costs and Expenses (Recovery)	1,653	530	382
Charged to Other Accounts	1	31	(54)
Deductions	(1,573)	(549)	(453)
Balance at End of Period	$ 2,121	$ 2,040	$ 2,028