Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net income	$ 1,316,000	$ 6,658,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	41,574,000	44,905,000
Amortization of deferred rent	350,000	(153,000)
Share-based compensation	18,094,000	14,660,000
Excess tax benefit related to share-based compensation	(3,111,000)	(12,700,000)
Provision for doubtful accounts	5,505,000	4,833,000
Amortization of deferred financing costs	1,411,000	1,735,000
Deferred income taxes	(7,757,000)	(9,806,000)
Loss on early extinguishment of debt	18,619,000
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(39,559,000)	(37,512,000)
Prepaid expenses and other current assets	(954,000)	(4,121,000)
Accounts payable and accrued expenses	6,875,000	22,137,000
Accrued interest expense	2,225,000	(5,356,000)
Deferred revenue and customer deposits	(1,458,000)	(48,000)
Other liabilities	(1,502,000)	(271,000)
Net cash provided by operating activities	41,628,000	24,961,000
Investing activities:
Cash paid for acquisitions, net	(11,770,000)	(187,402,000)
Purchases of building, equipment and leasehold improvements, net	(7,337,000)	(6,192,000)
Working capital and other settlements for acquisitions	(181,000)	(2,366,000)
Proceeds from (cash paid for) foreign currency net investment hedges	4,122,000	(362,000)
Other	(1,427,000)	(939,000)
Net cash used in investing activities	(16,593,000)	(197,261,000)
Financing activities:
Borrowings under senior unsecured notes	500,000,000
Borrowings under senior secured revolving credit facility	25,478,000	269,621,000
Proceeds from the exercise of options and warrants	13,737,000	35,394,000
Excess tax benefit related to share-based compensation	3,111,000	12,700,000
Repayment of subordinated unsecured notes payable		(333,000)
Net borrowings (repayments) under working capital facilities	(607,000)	7,506,000
Repayment of contingent earnout obligation	(5,064,000)	(4,362,000)
Payment of deferred financing costs	(8,706,000)	(251,000)
Payment for early redemption of senior unsecured notes	(14,618,000)
Repayments under senior secured revolving credit facility	(169,331,000)	(151,290,000)
Repayment of senior unsecured notes	(250,000,000)
Other		(53,000)
Net cash provided by financing activities	94,000,000	168,932,000
Exchange rate impact on cash and cash equivalents	(1,448,000)	(350,000)
Net increase (decrease) in cash and cash equivalents	117,587,000	(3,718,000)
Cash and cash equivalents, beginning of period	9,751,000	12,829,000
Cash and cash equivalents, end of period	127,338,000	9,111,000
Supplemental disclosures of cash flow information:
Cash paid for interest	22,137,000	27,019,000
Cash paid for income taxes	$ 7,648,000	$ 1,536,000