Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Examination [Line Items]
Unrecognized tax benefits	$ 5,634,000	$ 5,296,000	$ 4,510,000	$ 5,238,000
Uncertain tax positions that would affect the effective tax rate if recognized	5,600,000	5,300,000	4,500,000
Offsetting reduction of a corresponding deferred tax asset	2,100,000	1,500,000	2,300,000
Interest and penalties	0	400,000	400,000
Accrued interest	100,000	200,000
Penalties	0	0
Subsidiaries under audit in Germany	15
Deferred tax assets associated with net operating loss and interest carryforwards	29,045,000	26,952,000
Valuation allowances associated with net operating loss carryforwards	6,335,000	11,760,000
Carryforwards related to interest expense unable to be deducted from current period income	14,100,000	12,400,000
Income tax benefit due to the reversal of valuation allowance associated with net operating loss carryforwards in the United Kingdom	7,000,000
Deferred tax	5,500,000
Deferred income taxes on undistributed earnings of non-U.S. subsidiaries	531,800,000	449,400,000
Tax Expense due to absence of exemption under American Taxpayer Relief Act of 2012	3,100,000
Foreign Country
Income Tax Examination [Line Items]
Income tax jurisdictions outside U.S.	30
Robuschi spA
Income Tax Examination [Line Items]
Unrecognized tax benefits	$ 1,300,000