Schedule of Debt and Capital Lease Obligations (Parenthetical) (Detail) In Thousands, unless otherwise specified			3 Months Ended				3 Months Ended				3 Months Ended
	Mar. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 Credit Line, Due 2013 USD ($)		Dec. 31, 2012 Credit Line, Due 2013 USD ($)		Mar. 31, 2013 Term Loan, Denominated In U.S. Dollars, Due 2013 USD ($)		Dec. 31, 2012 Term Loan, Denominated In U.S. Dollars, Due 2013 USD ($)		Mar. 31, 2013 Term Loan, Denominated In Euros ("EUR"), Due 2013 USD ($)		Dec. 31, 2012 Term Loan, Denominated In Euros ("EUR"), Due 2013 USD ($)		Mar. 31, 2013 Secured Mortgages USD ($)		Mar. 31, 2013 Secured Mortgages EUR (€)	Dec. 31, 2012 Secured Mortgages USD ($)
Debt Instrument [Line Items]
Applicable rate from interest rate of loan varying with prime, federal funds and/or LIBOR			2.00%				1.80%				2.10%
Weighted average interest rate of loan with prime, federal funds and/or LIBOR			1.90%				1.90%				2.10%
Total long-term debt, including current maturities	$ 320,896	$ 366,872	$ 85,000	[1]	$ 112,000	[1]	$ 198,077	[2]	$ 214,615	[2]	$ 19,245	[3]	$ 29,718	[3]	$ 3,770	[4]	€ 2,941	$ 3,880	[4]

[1] The loans under this facility may be denominated in USD or several foreign currencies. The interest rates under the facility are based on prime, federal funds and/or the London Interbank offer rate ("LIBOR") for the applicable currency. At March 31, 2013, the applicable rate was 2.0%, and the weighted-average rate was 1.9% for the three-month period ended March 31, 2013.

[2] The interest rate for this loan varies with prime, federal funds and/or LIBOR. At March 31, 2013, the applicable rate was 1.8%, and the weighted-average rate was 1.9% for the three-month period ended March 31, 2013.

[3] The interest rate for this loan varies with LIBOR. At March 31, 2013, this rate was 2.1%, and the weighted-average rate was 2.1% for the three-month period ended March 31, 2013.

[4] This amount consists of a fixed-rate commercial loan with an outstanding balance of €2,941 at March 31, 2013. The loan is secured by the Company's facility in Bad Neustadt, Germany.