Income Taxes (Summary Of The Provision For Income Taxes And The U.S. Federal Tax Rate) (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
Income Taxes [Line Items]
Income tax expense at federal statutory rate	35.00%	35.00%
Foreign income tax differential, rate	(2.70%)	(4.00%)
State taxes, net of federal benefit, rate	0.80%	1.40%
Foreign-sourced nontaxable income, rate	(3.50%)	(1.50%)
Other, rate	1.30%	0.90%
Provision for income taxes	30.90%	31.80%
Income tax expense at federal statutory rate, amount	$ 27,544	$ 18,840
Foreign income tax differential, amount	(2,155)	(2,164)
State taxes, net of federal benefit, amount	653	730
Foreign-sourced nontaxable income, amount	(2,729)	(793)
Other, amount	982	500
Provision for income taxes	$ 24,295	$ 17,113	$ 42,540	$ 31,937