Note 14 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 14,051	$ 18,755
Investing activities:
Cash paid for acquisitions, net	(11,145)	(185,128)
Purchases of equipment and leasehold improvements, net	(4,843)	(3,610)
Working capital and other settlements for acquisitions	(91)	(2,299)
Cash proceeds from (paid for) foreign currency net investment hedge	2,930	(5,044)
Other	(1,310)	(839)
Net cash used in investing activities	(14,459)	(196,920)
Financing activities:
Borrowings under senior unsecured notes	500,000
Borrowings under senior secured revolving credit facility	25,478	219,995
Proceeds from the exercise of options and warrants	11,451	23,090
Excess tax benefit related to share-based compensation	2,147	7,314
Net borrowings (repayments) under working capital facilities	827	1,160
Repayment of contingent earnout obligation	(1,023)
Payment of deferred financing costs	(8,676)	(241)
Payment for early redemption of senior unsecured notes	(14,618)
Repayment of subordinated unsecured notes payable		(333)
Repayment under senior secured revolving credit facility	(169,331)	(78,000)
Repayments of senior unsecured notes	(250,000)
Intercompany notes and investments and other		(53)
Net cash provided by (used in) financing activities	96,255	172,932
Exchange rate impact on cash and cash equivalents	(505)	295
Net increase (decrease) in cash and cash equivalents	95,342	(4,938)
Cash and cash equivalents, beginning of period	9,751	12,829
Cash and cash equivalents, end of period	105,093	7,891
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	6,735	13,234
Investing activities:
Cash paid for acquisitions, net	(11,145)	(175,590)
Purchases of equipment and leasehold improvements, net	(3,323)	(2,864)
Working capital and other settlements for acquisitions	(91)	(430)
Cash proceeds from (paid for) foreign currency net investment hedge	2,930	(5,044)
Other	(1,310)	(839)
Net cash used in investing activities	(12,939)	(184,767)
Financing activities:
Repayment of subordinated unsecured notes payable		(333)
Intercompany notes and investments and other	96,594	172,105
Net cash provided by (used in) financing activities	96,594	171,772
Net increase (decrease) in cash and cash equivalents	90,390	239
Cash and cash equivalents, beginning of period	388	760
Cash and cash equivalents, end of period	90,778	999
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	7,316	5,521
Investing activities:
Cash paid for acquisitions, net		(9,538)
Purchases of equipment and leasehold improvements, net	(1,520)	(746)
Working capital and other settlements for acquisitions		(1,869)
Net cash used in investing activities	(1,520)	(12,153)
Financing activities:
Net borrowings (repayments) under working capital facilities	827	1,160
Repayment of contingent earnout obligation	(1,023)
Payment of deferred financing costs	(143)
Net cash provided by (used in) financing activities	(339)	1,160
Exchange rate impact on cash and cash equivalents	(505)	295
Net increase (decrease) in cash and cash equivalents	4,952	(5,177)
Cash and cash equivalents, beginning of period	9,363	12,069
Cash and cash equivalents, end of period	14,315	6,892
Parent Company [Member]
Financing activities:
Borrowings under senior unsecured notes	500,000
Borrowings under senior secured revolving credit facility	25,478	219,995
Proceeds from the exercise of options and warrants	11,451	23,090
Excess tax benefit related to share-based compensation	2,147	7,314
Payment of deferred financing costs	(8,533)	(241)
Payment for early redemption of senior unsecured notes	(14,618)
Repayment under senior secured revolving credit facility	(169,331)	(78,000)
Repayments of senior unsecured notes	(250,000)
Intercompany notes and investments and other	$ (96,594)	$ (172,158)