Schedule of Debt and Capital Lease Obligations (Parenthetical) (Detail) In Thousands, unless otherwise specified			9 Months Ended				9 Months Ended				9 Months Ended
	Sep. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2012 Credit Line, Due 2013 USD ($)		Dec. 31, 2011 Credit Line, Due 2013 USD ($)		Sep. 30, 2012 Term Loan, Denominated In U.S. Dollars, Due 2013 USD ($)		Dec. 31, 2011 Term Loan, Denominated In U.S. Dollars, Due 2013 USD ($)		Sep. 30, 2012 Term Loan, Denominated In Euros ("EUR"), Due 2013 USD ($)		Dec. 31, 2011 Term Loan, Denominated In Euros ("EUR"), Due 2013 USD ($)		Sep. 30, 2012 Secured Mortgages USD ($)		Sep. 30, 2012 Secured Mortgages EUR (€)	Dec. 31, 2011 Secured Mortgages USD ($)
Debt Instrument [Line Items]
Applicable rate from interest rate of loan varying with prime, federal funds and/or LIBOR			1.80%				1.80%				2.10%
Average interest rate of loan with prime, federal funds and/or LIBOR			1.90%				1.90%				2.30%
Total long-term debt, including current maturities	$ 439,546	$ 401,433	$ 157,000	[1]	$ 72,000	[1]	$ 231,154	[2]	$ 260,000	[2]	$ 38,615	[3]	$ 50,596	[3]	$ 6,160	[4]	€ 4,791	$ 6,504	[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 September 30, 2012, the applicable rate was 1.8%, and the weighted-average rate was 1.9% for the nine-month period ended September 30, 2012.

[2] The interest rate for this loan varies with prime, federal funds and/or LIBOR. At September 30, 2012, the applicable rate was 1.8%, and the weighted-average rate was 1.9% for the nine-month period ended September 30, 2012.

[3] The interest rate for this loan varies with LIBOR. At September 30, 2012, this rate was 2.1%, and the weighted-average rate was 2.3% for the nine-month period ended September 30, 2012.

[4] This amount consists of two fixed-rate commercial loans with an outstanding balance of €4,791 at September 30, 2012. The loans are secured by the Company's facility in Bad Neustadt, Germany.