CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	$ 92,834	$ 106,305
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation	79,999	77,340
Amortization	55,854	50,575
Asset impairment	3,715
Provision for share based compensation	23,276	3,537
Deferred income tax expense	10,317	22,423
Amortization of debt acquisition costs	13,305	10,056
Other	185	198
Changes in operating assets and liabilities, net of business acquisitions:
Accounts receivable	(35,951)	(42,159)
Other assets	(63,309)	(11,430)
Accounts payable	(1,045)	8,437
Accrued wages	17,403	15,368
Accrued expenses, other liabilities and income tax payable	47,364	49,958
Net cash flows from operating activities	243,947	290,608
CASH FLOWS FROM INVESTING ACTIVITIES:
Business acquisitions, net of cash acquired of $1,350 and $4,780	(77,264)	(211,531)
Purchases of property and equipment	(87,860)	(80,538)
Other	(163)	102
Net cash flows from investing activities	(165,287)	(291,967)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving credit and accounts receivable securitization facilities	305,800	604,500
Payments on revolving credit and accounts receivable securitization facilities	(305,800)	(604,500)
Proceeds from new term loan facility	970,000
Payment on term loan facility	(448,434)
Dividends paid	(510,634)
Debt issuance costs	(27,498)	(739)
Principal repayments on long-term obligations	(13,993)	(17,201)
Proceeds from stock options exercised including excess tax benefits	8,248	128
Repurchase of common stock	(1,488)	(4,829)
Payments of capital lease obligations	(44)	(701)
Net cash flows from financing activities	(23,843)	(23,342)
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	264	1,716
NET CHANGE IN CASH AND CASH EQUIVALENTS	55,081	(22,985)
CASH AND CASH EQUIVALENTS, Beginning of period	93,836	97,793
CASH AND CASH EQUIVALENTS, End of period	148,917	74,808
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for interest	174,786	168,189
Cash paid during the period for income taxes, net of refunds of $2,689 and $1,456	55,844	25,541
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING ACTIVITIES:
Acquisition of property through accounts payable commitments	$ 11,759	$ 5,093