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Business Combinations (Results Of Operations) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 2012 Acquisitions [Member]	Sep. 30, 2011 2012 Acquisitions [Member]	Sep. 30, 2012 2012 Acquisitions [Member]	Sep. 30, 2011 2012 Acquisitions [Member]	Sep. 30, 2011 2011 Acquisitions [Member]	Sep. 30, 2010 2011 Acquisitions [Member]	Sep. 30, 2011 2011 Acquisitions [Member]	Sep. 30, 2010 2011 Acquisitions [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Total revenues					$ 304,776	$ 292,599	$ 907,796	$ 866,115	$ 261,015	$ 260,735	$ 782,561	$ 783,433
Income before income taxes					81,998	81,785	239,286	238,144	72,933	77,284	215,159	227,040
Net income					$ 49,715	$ 49,699	$ 143,630	$ 144,021	$ 44,319	$ 47,501	$ 130,119	$ 137,420
Net income per share, Basic					$ 0.35	$ 0.35	$ 1.00	$ 1.01	$ 0.31	$ 0.33	$ 0.91	$ 0.97
Net income per share, Diluted					$ 0.34	$ 0.34	$ 0.98	$ 1.00	$ 0.31	$ 0.33	$ 0.90	$ 0.96
Weighted average number of shares outstanding:
Weighted average number of shares outstanding, Basic	139,465	138,690	139,185	138,475	139,465	138,690	139,185	138,475	138,690	138,093	138,475	137,802
Weighted average number of shares outstanding, Diluted	142,097	140,443	141,769	140,120	142,097	140,443	141,769	140,120	140,443	139,507	140,120	139,128

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