Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Valuation allowance for deferred income tax assets	$ 9,344,000	$ 8,783,000	$ 11,400,000
(Increase) decrease in total valuation allowance	(500,000)	2,600,000	(2,800,000)
Tax effect of state and foreign net operating loss carryforwards	17,115,000	15,615,000
2013	600,000
2014	800,000
2015	200,000
2016	200,000
2017	500,000
Thereafter	14,800,000
Valuation allowance state net operating loss carryforwards	4,900,000
Not provided U.S. income taxes of unremitted foreign earnings	105,000,000
Reduction due to expiration of certain federal and state statutes of limitations	11,965,000	8,640,000	10,261,000
Settlements	895,000	4,877,000	93,000
Interest and penalties expense (income) in the provision for income taxes	$ (1,100,000)	$ 700,000	$ (2,200,000)