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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (loss), net of income tax, recorded through other comprehensive income	$ 1,521	$ (317)	$ 586	$ (317)
Balance included in accumulated other comprehensive income at June 30, 2012	$ (2,618)	$ (5,450)	$ (2,618)	$ (5,450)