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Changes In Equity And Comprehensive Income (Summary Of Changes In Equity) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, beginning of period | $ 927,376 | $ 822,056
Dividends | (16,144) | (15,090)
Reacquisition on open market | 0 | 0
Exercise of stock options, net of shares reacquired | 13,609 | 7,323
Stock compensation expense | 5,379 | 4,007
Excess tax benefit from stock based compensation | 2,928 | 2,947
Net income | 57,942 | 51,796
Other comprehensive income (loss) | (17,797) | 22,817
Comprehensive income | 40,145 | 74,613
Balance, end of period | 973,293 | 895,856
Parent [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, beginning of period | 918,383 | 813,553
Dividends | (16,144) | (15,090)
Reacquisition on open market | 0 | 0
Exercise of stock options, net of shares reacquired | 13,609 | 7,323
Stock compensation expense | 5,379 | 4,007
Excess tax benefit from stock based compensation | 2,928 | 2,947
Net income | 57,791 | 51,662
Other comprehensive income (loss) | (17,807) | 22,791
Comprehensive income | 39,984 | 74,453
Balance, end of period | 964,139 | 887,193
Noncontrolling Interest |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, beginning of period | 8,993 | 8,503
Net income | 151 | 134
Other comprehensive income (loss) | 10 | 26
Comprehensive income | 161 | 160
Balance, end of period | $ 9,154 | $ 8,663

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