Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Valuation allowance for deferred income tax assets	$ 15,186,000	$ 15,644,000	$ 9,300,000
(Increase) decrease in total valuation allowance	400,000	(6,300,000)	(500,000)
Tax effect of state and foreign net operating loss carryforwards	21,511,000	20,828,000
2015	100,000
2016	0
2017	700,000
2018	100,000
2019	0
Thereafter	24,400,000
Valuation allowance foreign and state net operating loss carryforwards	13,900,000
Not provided U.S. income taxes of unremitted foreign earnings	344,500,000
Reduction due to expiration of certain federal and state statutes of limitations	9,376,000	11,479,000	11,965,000
Interest and penalties expense (income) in the provision for income taxes	500,000	(300,000)	(1,100,000)
Gross Amount Before Balance Sheet Presentation Netting [Member]
Income Taxes [Line Items]
Tax effect of state and foreign net operating loss carryforwards	$ 25,300,000
Minimum [Member]
Income Taxes [Line Items]
Income Tax Examination, Year under Examination	2011
Open Tax Year	2013
Maximum [Member]
Income Taxes [Line Items]
Income Tax Examination, Year under Examination	2012
Open Tax Year	2014