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 Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 421	$ 390	$ 449
Charges to costs and expenses	183	211	9
Deductions	(212)	(180)	(68)
Balance at end of year	392	421	390
Deferred Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year
Charges to costs and expenses	21,743
Deductions	1,263
Balance at end of year	$ 20,480