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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			$ 1,214,673
Dividends			(54,759)
Exercise of stock options, net of shares reacquired			8,747
Stock compensation expense			15,944
Excess tax benefit from stock based compensation			7,869
Net income	28,216	57,483	136,997	170,839
Other comprehensive income (loss)	(69,306)	32,633	(57,641)	14,887
Comprehensive income	(41,090)	90,116	79,356	185,726
Less: Noncontrolling interests in comprehensive income (loss)	(12)	427	413	974
Balance, end of period	1,271,830		1,271,830
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			1,204,319
Dividends			(54,759)
Exercise of stock options, net of shares reacquired			8,747
Stock compensation expense			15,944
Excess tax benefit from stock based compensation			7,869
Net income			136,460
Other comprehensive income (loss)			(57,517)
Comprehensive income			78,943
Balance, end of period	1,261,063		1,261,063
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			10,354
Net income			537
Other comprehensive income (loss)			(124)
Balance, end of period	$ 10,767		$ 10,767