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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
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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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