Changes In Equity And Comprehensive Income (Summary Of Changes In Equity) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			$ 927,376	$ 822,056
Dividends			(49,819)	(45,998)
Reacquisition on open market			0	(49,991)
Exercise of stock options, net of shares reacquired			24,107	7,958
Stock compensation expense			16,299	12,860
Excess tax benefit from stock based compensation			5,787	3,233
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	57,483	57,307	170,839	171,850
Other comprehensive income (loss)	32,633	2,279	14,887	10,784
Comprehensive income	90,116	59,586	185,726	182,634
Balance, end of period	1,109,476	932,752	1,109,476	932,752
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			918,383	813,553
Dividends			(49,819)	(45,998)
Reacquisition on open market			0	(49,991)
Exercise of stock options, net of shares reacquired			24,107	7,958
Stock compensation expense			16,299	12,860
Excess tax benefit from stock based compensation			5,787	3,233
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			169,796	171,349
Other comprehensive income (loss)			14,956	11,201
Comprehensive income			184,752	182,550
Balance, end of period	1,099,509	924,165	1,099,509	924,165
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			8,993	8,503
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			1,043	501
Other comprehensive income (loss)			(69)	(417)
Comprehensive income			974	84
Balance, end of period	$ 9,967	$ 8,587	$ 9,967	$ 8,587