Changes In Equity And Comprehensive Income (Summary Of Changes In Equity) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			$ 1,214,673	$ 927,376
Dividends			(35,293)	(32,379)
Reacquisition on open market			0	0
Exercise of stock options, net of shares reacquired			7,847	20,030
Stock compensation expense			10,589	10,386
Excess tax benefit from stock based compensation			7,465	4,922
Net income	59,909	55,414	108,781	113,356
Other comprehensive income (loss)	12,693	51	11,665	(17,746)
Comprehensive income	72,602	55,465	120,446	95,610
Balance, end of period	1,325,727	1,025,945	1,325,727	1,025,945
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			1,204,319	918,383
Dividends			(35,293)	(32,379)
Reacquisition on open market			0	0
Exercise of stock options, net of shares reacquired			7,847	20,030
Stock compensation expense			10,589	10,386
Excess tax benefit from stock based compensation			7,465	4,922
Net income			108,381	112,665
Other comprehensive income (loss)			11,640	(17,602)
Comprehensive income			120,021	95,063
Balance, end of period	1,314,948	1,016,405	1,314,948	1,016,405
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period			10,354	8,993
Net income			400	691
Other comprehensive income (loss)			25	(144)
Comprehensive income			425	547
Balance, end of period	$ 10,779	$ 9,540	$ 10,779	$ 9,540