Schedule II - Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation and qualifying accounts, beginning balance	$ 300	$ 300	$ 557
Charged to costs and expenses	157	12	(8)
Charged to other accounts	(51)	(1)	(249)
Deductions	(127)	(11)
Valuation and qualifying accounts, ending balance	279	300	300
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation and qualifying accounts, beginning balance	12,204	15,019	14,890
Charged to costs and expenses	(1,048)	(2,980)	(621)
Charged to other accounts	21	(45)
Deductions	58	210	750
Valuation and qualifying accounts, ending balance	$ 11,235	$ 12,204	$ 15,019