Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Net operating losses carry forward expiration date	Dec. 31, 2033
Gross unrecognized tax benefits	$ 3,108,000	$ 3,134,000	$ 3,374,000	$ 4,500,000
Unrecognized tax benefits that would impact effective tax rate	3,100,000	3,100,000	3,400,000
Gross amount of interest and penalties	0	100,000	300,000
Accrued for potential payment of interest and penalties	600,000	600,000
Gross unrecognized tax benefit change in next 12 months, minimum	0
Gross unrecognized tax benefit change in next 12 months, maximum	$ 1,200,000
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
State tax credits carry forward expiration date	Dec. 31, 2018