Gains and Losses Net of Income Tax Associated with Changes in Fair Value of Euro Term Loan and Net Balance of Such Gains and Losses Included in Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (loss), net of income tax, recorded through other comprehensive income	$ (403)	$ 1,955	$ 183	$ 1,638
Balance included in accumulated other comprehensive income at September 30, 2012	$ (2,167)	$ (3,495)	$ (2,167)	$ (3,495)