Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows - operating activities:
Net income including noncontrolling interests	$ 41,842	$ 30,718
Depreciation and amortization	8,867	8,155
Amortization of identifiable intangible assets	9,504	6,336
Deferred income taxes	4,513	3,487
Loss on sale of subsidiary	596	0
Excess tax benefits from share-based compensation	(4,869)	(418)
Equity loss (income) from unconsolidated entities	460	(59)
Other non-cash items	1,038	1,779
Distributions from unconsolidated entities	72	600
Changes in operating assets and liabilities, excluding the effect of businesses acquired	(86,339)	(145,700)
Net cash used in operating activities	(24,316)	(95,102)
Cash flows - investing activities:
Proceeds from sale of subsidiary	1,121	0
Proceeds from sale of property, plant and equipment	931	549
Purchase of property, plant and equipment	(8,073)	(7,005)
Investments in and advances to unconsolidated entities and joint ventures	(300)	0
Net cash used in investing activities	(6,321)	(6,456)
Cash flows - financing activities:
Repayments of long-term debt	(4,377)	(2)
Repayments of capital lease obligations	(491)	(390)
Dividends paid to stockholders	(5,353)	0
Proceeds from exercise of stock options	3,974	1,714
Payments to satisfy minimum tax withholding	(1,481)	(927)
Issuance of common stock under employee stock purchase plan	866	671
Payments for contingent consideration arrangements	0	(537)
Distributions to noncontrolling interests	(900)	(1,050)
Excess tax benefits from share-based compensation	4,869	418
Net cash used in financing activities	(2,893)	(103)
Effect of exchange rate changes on cash and cash equivalents	385	(4,540)
Decrease in cash and cash equivalents	(33,145)	(106,201)
Cash and cash equivalents at beginning of year	439,813	605,303
Cash and cash equivalents at end of period	406,668	499,102
Cash paid for:
Interest	1,527	1,344
Income taxes	2,295	28,311
Non-cash financing activities:
Assets acquired under capital lease obligations	$ 50	$ 169