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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, 2014
Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period $ 1,214,673 $ 927,376
Dividends (17,616) (16,144)
Reacquisition on open market 0 0
Exercise of stock options, net of shares reacquired 3,752 13,609
Stock compensation expense 5,647 5,379
Excess tax benefit from stock based compensation 5,145 2,928
Net income 48,872 57,942
Other comprehensive income (loss) (1,028) (17,797)
Comprehensive income 47,844 40,145
Balance, end of period 1,259,445 973,293
Parent [Member]
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period 1,204,319 918,383
Dividends (17,616) (16,144)
Reacquisition on open market 0 0
Exercise of stock options, net of shares reacquired 3,752 13,609
Stock compensation expense 5,647 5,379
Excess tax benefit from stock based compensation 5,145 2,928
Net income 48,684 57,791
Other comprehensive income (loss) (1,003) (17,807)
Comprehensive income 47,681 39,984
Balance, end of period 1,248,928 964,139
Noncontrolling Interest
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period 10,354 8,993
Net income 188 151
Other comprehensive income (loss) (25) 10
Comprehensive income 163 161
Balance, end of period $ 10,517 $ 9,154