Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net income (loss)	$ 6,658	$ (8,626)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on interest rate swap		(101)
Depreciation and amortization	44,905	48,058
Amortization of deferred rent	(153)	(280)
Share-based compensation	14,660	12,234
Excess tax benefit related to share-based compensation	(12,700)	(5,974)
Provision for doubtful accounts	4,833	3,506
Amortization of deferred financing costs	1,735	1,636
Deferred income taxes	(9,806)	(12,963)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(37,512)	(22,327)
Prepaid expenses and other current assets	(4,121)	(361)
Accounts payable and accrued expenses	22,137	12,588
Accrued interest expense	(5,356)	(6,082)
Deferred revenue and customer deposits	(48)	1,824
Other liabilities	(271)	(414)
Net cash provided by operating activities	24,961	22,718
Investing activities:
Cash paid for acquisitions, net	(187,402)
Purchases of building, equipment and leasehold improvements, net	(6,192)	(4,758)
Working capital and other settlements for acquisitions	(2,366)	(569)
Proceeds from (cash paid for) foreign currency net investment hedges	(362)	500
Other	(939)	(332)
Net cash used in investing activities	(197,261)	(5,159)
Financing activities:
Borrowings under senior secured revolving credit facility	269,621	103,597
Proceeds from the exercise of options and warrants	35,394	13,089
Excess tax benefit related to share-based compensation	12,700	5,974
Net borrowings under working capital facilities	7,506	215
Payment of deferred financing costs	(251)	(168)
Repayment of subordinated unsecured notes payable	(333)	(270)
Payment of contingent earnout obligation	(4,362)
Repayments under senior secured revolving credit facility	(151,290)	(136,301)
Other	(53)
Net cash provided by (used in) financing activities	168,932	(13,864)
Exchange rate impact on cash and cash equivalents	(350)	(277)
Net increase (decrease) in cash and cash equivalents	(3,718)	3,418
Cash and cash equivalents, beginning of period	12,829	8,627
Cash and cash equivalents, end of period	9,111	12,045
Supplemental disclosures of cash flow information:
Cash paid for interest	27,019	26,570
Cash paid for income taxes	$ 1,536	$ 7,604