Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities:
Net income (loss)	$ (5,839,000)	$ 3,243,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	28,577,000	29,200,000
Amortization of deferred rent	353,000	(122,000)
Share-based compensation	12,701,000	9,980,000
Excess tax benefit related to share-based compensation	(2,147,000)	(7,314,000)
Provision for doubtful accounts	3,866,000	3,266,000
Amortization of deferred financing costs	1,031,000	1,152,000
Deferred income taxes	(8,275,000)	(4,683,000)
Loss on early extinguishment of debt	18,619,000
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(26,740,000)	(25,236,000)
Prepaid expenses and other current assets	(360,000)	(2,937,000)
Accounts payable and accrued expenses	(1,363,000)	12,017,000
Accrued interest expense	(4,807,000)	240,000
Deferred revenue and customer deposits	(904,000)	134,000
Other liabilities	(661,000)	(185,000)
Net cash provided by operating activities	14,051,000	18,755,000
Investing activities:
Cash paid for acquisitions, net	(11,145,000)	(185,128,000)
Purchases of building, equipment and leasehold improvements, net	(4,843,000)	(3,610,000)
Working capital and other settlements for acquisitions	(91,000)	(2,299,000)
Proceeds from (cash paid for) foreign currency net investment hedges	2,930,000	(5,044,000)
Other	(1,310,000)	(839,000)
Net cash used in investing activities	(14,459,000)	(196,920,000)
Financing activities:
Borrowings under senior unsecured notes	500,000,000
Borrowings under senior secured revolving credit facility	25,478,000	219,995,000
Proceeds from the exercise of options and warrants	11,451,000	23,090,000
Excess tax benefit related to share-based compensation	2,147,000	7,314,000
Net borrowings under working capital facilities	827,000	1,160,000
Repayment of subordinated unsecured notes payable		(333,000)
Repayment of contingent earnout obligation	(1,023,000)
Payment of deferred financing costs	(8,676,000)	(241,000)
Payment for early redemption of senior unsecured notes	(14,618,000)
Repayments under senior secured revolving credit facility	(169,331,000)	(78,000,000)
Repayment of senior unsecured notes	(250,000,000)
Other		(53,000)
Net cash provided by financing activities	96,255,000	172,932,000
Exchange rate impact on cash and cash equivalents	(505,000)	295,000
Net increase (decrease) in cash and cash equivalents	95,342,000	(4,938,000)
Cash and cash equivalents, beginning of period	9,751,000	12,829,000
Cash and cash equivalents, end of period	105,093,000	7,891,000
Supplemental disclosures of cash flow information:
Cash paid for interest	21,579,000	13,744,000
Cash paid for (refund from) income taxes	$ 3,559,000	$ (336,000)