Schedule II - Valuation and Qualifying Accounts and Reserves Supplemental Schedule (Detail) (Accounts Receivable Reserves [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable Reserves [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 2,028	$ 2,153	$ 2,457
Charged to Costs and Expenses (Recovery)	530	382	1,249
Charged to Other Accounts	31	(54)	(70)
Deductions	(549)	(453)	(1,483)
Balance at End of Period	$ 2,040	$ 2,028	$ 2,153