Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Cash received from customers	$ 2,090,030	$ 2,063,805	$ 2,018,755
Cash paid to suppliers and employees	(1,797,688)	(1,654,943)	(1,639,848)
Interest paid	(61,233)	(46,369)	(56,859)
Income tax payments	(71,144)	(93,697)	(68,750)
Investment proceeds and miscellaneous receipts, net	16,760	12,991	9,686
Excess tax benefits from share-based compensation	(2,720)	(2,889)	(3,168)
Proceeds from (payments for) forward foreign exchange contracts, net	1,471	(2,870)	2,919
Net cash provided by operating activities	175,476	276,028	262,735
Cash flows from investing activities:
Capital expenditures	(112,998)	(152,417)	(102,888)
Proceeds from dispositions of property, plant and equipment	1,214	6,325	234
Payments for acquisitions, net of cash received, and long-term investments	(72,054)	(39,443)	(158,538)
Payments for purchases of intangible assets	(700)	(1,780)	(436)
Payments for purchases of marketable securities and investments	(386,714)	(680,966)	(509,310)
Proceeds from sales of marketable securities and investments	289,779	131,295	48,825
Proceeds from maturities of marketable securities and investments	276,052	327,052	335,781
Net cash used in investing activities	(5,421)	(409,934)	(386,332)
Cash flows from financing activities:
Net payments on line-of-credit arrangements and notes payable	48	(191)	(3,900)
Payments on long-term borrowings	(300,228)	(620)	(226,835)
Proceeds from issuance of common stock	11,237	10,611	14,249
Payments of contingent consideration	(25,474)	0	0
Debt issuance costs on long-term borrowings	0	0	(242)
Purchase of treasury stock	0	(101)	0
Excess tax benefits from share-based compensation	2,720	2,889	3,168
Net cash (used in) provided by financing activities	(311,697)	12,588	(213,560)
Effect of foreign exchange rate changes on cash	9,805	10,475	4,837
Net decrease in cash and cash equivalents	(131,837)	(110,843)	(332,320)
Cash and cash equivalents at beginning of year	463,388	574,231	906,551
Cash and cash equivalents at end of year	$ 331,551	$ 463,388	$ 574,231