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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Cash received from customers $ 2,063,805 $ 2,018,755 $ 1,877,483
Cash paid to suppliers and employees (1,661,206) (1,656,467) (1,536,935)
Interest paid (46,369) (56,859) (59,834)
Income tax payments (87,434) (52,131) (55,502)
Investment proceeds and miscellaneous receipts, net 12,991 9,686 3,625
Excess tax benefits from share-based compensation (2,889) (3,168) (2,928)
Net cash provided by operating activities 278,898 259,816 225,909
Cash flows from investing activities:      
Capital expenditures (152,417) (102,888) (88,453)
Proceeds from sale of property, plant and equipment 6,325 234 1,190
Payments for acquisitions, net of cash received, and long-term investments (39,443) (158,538) (89,307)
Payments on purchases of intangible assets (1,780) (436) (4,081)
Purchases of marketable securities and investments (680,966) (509,310) (240,286)
Sales of marketable securities and investments 131,295 48,825 4,193
Maturities of marketable securities and investments 327,052 335,781 203,443
(Payments for) proceeds from foreign currency economic hedges, net (2,870) 2,919 3,211
Restricted cash 0 0 (6,422)
Net cash used in investing activities (412,804) (383,413) (216,512)
Cash flows from financing activities:      
Net payments on line-of-credit arrangements and notes payable (191) (3,900) (830)
Long-term borrowings 0 0 424,633
Payments on long-term borrowings (620) (226,835) (206,706)
Proceeds from issuance of common stock 10,611 14,249 12,730
Debt issuance costs on long-term borrowings 0 (242) (4,010)
Purchase of treasury stock (101) 0 0
Excess tax benefits from share-based compensation 2,889 3,168 2,928
Net cash provided by (used in) financing activities 12,588 (213,560) 228,745
Effect of foreign exchange rate changes on cash 10,475 4,837 18,471
Net (decrease) increase in cash and cash equivalents (110,843) (332,320) 256,613
Cash and cash equivalents at beginning of year 574,231 906,551 649,938
Cash and cash equivalents at end of year $ 463,388 $ 574,231 $ 906,551