Schedule of Debt and Capital Lease Obligations (Parenthetical) (Detail) In Thousands, unless otherwise specified			12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2012 Credit Line, Due 2013 USD ($)		Dec. 31, 2011 Credit Line, Due 2013 USD ($)		Dec. 31, 2012 Term Loan, Denominated In U.S. Dollars, Due 2013 USD ($)		Dec. 31, 2011 Term Loan, Denominated In U.S. Dollars, Due 2013 USD ($)		Dec. 31, 2012 Term Loan, Denominated In Euros ("EUR"), Due 2013 USD ($)		Dec. 31, 2011 Term Loan, Denominated In Euros ("EUR"), Due 2013 USD ($)		Dec. 31, 2012 Secured Mortgages USD ($)		Dec. 31, 2012 Secured Mortgages EUR (€)	Dec. 31, 2011 Secured Mortgages USD ($)
Debt Instrument [Line Items]
Applicable rate from interest rate of loan varying with prime, federal funds and/or LIBOR			2.00%				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	$ 366,872	$ 401,433	$ 112,000	[1]	$ 72,000	[1]	$ 214,615	[2]	$ 260,000	[2]	$ 29,718	[3]	$ 50,596	[3]	$ 3,880	[4]	€ 2,941	$ 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 December 31, 2012, the applicable rate was 2.0%, and the weighted-average rate was 1.9% for the twelve-month period ended December 31, 2012.

[2] The interest rate for this loan varies with prime, federal funds and/or LIBOR. At December 31, 2012, the applicable rate was 1.8%, and the weighted-average rate was 1.9% for the twelve-month period ended December 31, 2012.

[3] The interest rate for this loan varies with LIBOR. At December 31, 2012, the rate was 2.1%, and the weighted-average rate was 2.3% for the twelve-month period ended December 31, 2012.

[4] This amount consisted of two fixed-rate commercial loans as of December 31, 2011. One of these commercial loans was paid off in December 2012. The remaining commercial loan had an outstanding balance of €2,941 at December 31, 2012. The loan is secured by the Company's facility in Bad Neustadt, Germany.