Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Investments available-for-sale	$ 1,300,000	$ 2,000,000
Investments available-for-sale, Par Value	1,400,000
Investments available-for-sale, Temporary Impairment	72,000
Unrealized gain (loss) on investment securities, net of tax	222,000	87,000	(80,000)
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized gain (loss) on investment securities, net of tax	222,000
Tax effect of non-current ARS unrealized gain	119,000
Previously recorded Unrealized gain (loss) on investment securities, net of tax	138,000
Previously recorded tax effect of non-current ARS unrealized gain	$ 74,000