Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income (loss)	$ 2,024us-gaap_NetIncomeLoss	$ (289)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	14,848	14,342
Amortization of deferred rent	138us-gaap_AmortizationOfDeferredCharges	(44)us-gaap_AmortizationOfDeferredCharges
Share-based compensation	6,136us-gaap_ShareBasedCompensation	5,353us-gaap_ShareBasedCompensation
Excess tax benefit related to share-based compensation	(2,086)	(6,190)
Provision for doubtful accounts	1,918us-gaap_ProvisionForDoubtfulAccounts	1,359us-gaap_ProvisionForDoubtfulAccounts
Amortization of deferred financing costs	587us-gaap_AmortizationOfFinancingCosts	571us-gaap_AmortizationOfFinancingCosts
Deferred income taxes	(1,759)us-gaap_DeferredIncomeTaxExpenseBenefit	(2,228)us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(14,763)	(12,501)
Prepaid expenses and other current assets	1,010	(1,715)
Accounts payable and accrued expenses	4,668	9,612
Accrued interest expense	(5,640)	(5,457)
Deferred revenue and customer deposits	(133)	442
Other liabilities	(784)	(50)
Net cash provided by operating activities	6,164	3,205
Investing activities:
Cash paid for acquisitions, net	(2,299)	(97,153)
Purchases of building, equipment and leasehold improvements, net	(2,229)	(712)
Working capital and other settlements for acquisitions	(91)	(1,142)
Proceeds from (cash paid for) foreign currency net investment hedges	4,812	(3,356)
Other	(1,250)	(839)
Net cash used in investing activities	(1,057)	(103,202)
Financing activities:
Borrowings under senior secured revolving credit facility	25,478	121,012
Proceeds from the exercise of options and warrants	8,855	14,637
Excess tax benefit related to share-based compensation	2,086	6,190
Net borrowings (repayments) under working capital facilities	(132)	4,123
Payment of deferred financing costs		(225)us-gaap_PaymentsOfFinancingCosts
Repayment of subordinated unsecured notes payable		(333)us-gaap_RepaymentsOfSubordinatedDebt
Repayment of contingent earnout obligation	(1,023)
Repayments under senior secured revolving credit facility	(29,331)	(50,000)
Net cash provided by financing activities	5,933	95,404
Exchange rate impact on cash and cash equivalents	(509)	268
Net increase (decrease) in cash and cash equivalents	10,531	(4,325)
Cash and cash equivalents, beginning of period	9,751	12,829
Cash and cash equivalents, end of period	20,282	8,504
Supplemental disclosures of cash flow information:
Cash paid for interest	12,979us-gaap_InterestPaid	12,488us-gaap_InterestPaid
Cash paid for (refund from) income taxes	$ 2,703us-gaap_IncomeTaxesPaidNet	$ (1,042)us-gaap_IncomeTaxesPaidNet

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585

+ Details

Name:	us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_ProceedsFromRepaymentsOfOtherDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

+ Details

Name:	us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLongTermLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

+ References

+ Details

Name:	us-gaap_RepaymentsOfSubordinatedDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration