Income Taxes (Summary Of Provision For Income Taxes And U.S. Federal Tax Rate) (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
Income Taxes [Line Items]
Income tax expense at federal statutory rate	35.00%	35.00%
Foreign income tax differential, rate	(3.60%)	(4.10%)
Effect of statutory rate change, rate	(4.10%)	(0.80%)
State taxes, net of federal benefit, rate	1.70%	2.20%
Foreign-sourced nontaxable income, rate	(2.20%)	(1.20%)
Other, rate	1.00%	0.40%
Provision for income taxes	27.80%	31.50%
Income tax expense at federal statutory rate, amount	$ 28,909	$ 20,689
Foreign income tax differential, amount	(3,030)	(2,404)
Effect of statutory rate change, amount	(3,473)	(467)
State taxes, net of federal benefit, amount	1,366	1,262
Foreign-sourced nontaxable income, amount	(1,826)	(731)
Other, amount	997	248
Provision for income taxes, amount	$ 22,943	$ 18,597	$ 65,483	$ 50,534