Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities:
Net loss	$ (12,256)	$ (3,308)
Adjustments to reconcile net loss to net cash provided by operating activities:
Gain on interest rate swap	(169)	(253)
Depreciation and amortization	42,245	33,153
Amortization of deferred rent	(99)	(386)
Share-based compensation	12,562	5,385
Excess tax benefit related to share-based compensation		(3,112)
Provision for doubtful accounts	2,555	1,381
Amortization of deferred financing costs	1,612	1,433
Deferred income taxes	(15,346)	(6,299)
Loss on early extinguishment of debt		621
Other	(31)	223
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(20,850)	(3,469)
Prepaid expenses and other current assets	103	(786)
Accounts payable and accrued expenses	8,339	1,337
Accrued interest expense	(5,114)	4,562
Deferred revenue and customer deposits	1,938	(458)
Other liabilities	(402)	(3,218)
Net cash provided by operating activities	15,087	26,806
Investing activities:
Cash paid for acquisitions, net	(95,801)	(300,233)
Purchases of equipment and leasehold improvements, net	(4,857)	(4,121)
Working capital and other settlements for acquisitions	547	(1,884)
Net cash used in investing activities	(100,111)	(306,238)
Financing activities:
Borrowings under senior secured revolving credit facility	160,640	268,000
Excess tax benefit related to share-based compensation		3,112
Proceeds from the exercise of options and warrants	1,254	2,215
Borrowings under senior unsecured notes payable		250,000
Purchases of stock for treasury	(387)	(3,548)
Payment of deferred financing costs	(1,034)	(9,746)
Repayments of subordinated unsecured notes payable	(975)	(2,101)
Net borrowings (repayments) under working capital facilities	(5,517)	36,098
Repayments under senior secured revolving credit facility	(71,000)	(268,000)
Other	(95)	(358)
Net cash provided by financing activities	82,886	275,672
Exchange rate impact on cash and cash equivalents	128	5
Net decrease in cash and cash equivalents	(2,010)	(3,755)
Cash and cash equivalents, beginning of period	8,416	33,624
Cash and cash equivalents, end of period	6,406	29,869
Supplemental disclosure of noncash investing and financing activities:
Issuance of common stock for acquisitions	85	45,386
Issuance of common stock to settle earnout obligations		808
Supplemental disclosures of cash flow information:
Cash paid for interest	23,860	4,759
Cash paid for income taxes	$ 5,513	$ 3,190