Note 14 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 18,755	$ 17,614
Investing activities:
Cash paid for acquisitions, net	(185,128)
Purchases of equipment and leasehold improvements, net	(3,610)	(3,313)
Working capital and other settlements for acquisitions	(2,299)
Foreign currency net investment hedge	(5,044)	3,810
Net cash provided by (used in) investing activities	(196,920)	497
Other	(839)
Financing activities:
Borrowings under senior secured revolving credit facility	219,995	77,000
Proceeds from the exercise of options and warrants	23,090	6,032
Excess tax benefit related to share-based compensation	7,314	1,752
Net borrowings under working capital facilities	1,160	(3,216)
Payment of deferred financing costs	(241)	(52)
Repayment of subordinated unsecured notes payable	(333)
Repayment under senior secured revolving credit facility	(78,000)	(98,300)
Intercompany notes and investments and other	(53)
Net cash provided by (used in) financing activities	172,932	(16,784)
Exchange rate impact on cash and cash equivalents	295	(787)
Net increase (decrease) in cash and cash equivalents	(4,938)	540
Cash and cash equivalents, beginning of period	12,829	8,627
Cash and cash equivalents, end of period	7,891	9,167
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	13,234	8,832
Investing activities:
Cash paid for acquisitions, net	(175,590)
Purchases of equipment and leasehold improvements, net	(2,864)	(1,629)
Working capital and other settlements for acquisitions	(430)
Foreign currency net investment hedge	(5,044)	3,810
Net cash provided by (used in) investing activities	(184,767)	2,181
Other	(839)
Financing activities:
Repayment of subordinated unsecured notes payable	(333)
Intercompany notes and investments and other	172,105	(13,568)
Net cash provided by (used in) financing activities	171,772	(13,568)
Net increase (decrease) in cash and cash equivalents	239	(2,555)
Cash and cash equivalents, beginning of period	760	4,125
Cash and cash equivalents, end of period	999	1,570
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	5,521	8,782
Investing activities:
Cash paid for acquisitions, net	(9,538)
Purchases of equipment and leasehold improvements, net	(746)	(1,684)
Working capital and other settlements for acquisitions	(1,869)
Net cash provided by (used in) investing activities	(12,153)	(1,684)
Financing activities:
Net borrowings under working capital facilities	1,160	(3,216)
Net cash provided by (used in) financing activities	1,160	(3,216)
Exchange rate impact on cash and cash equivalents	295	(787)
Net increase (decrease) in cash and cash equivalents	(5,177)	3,095
Cash and cash equivalents, beginning of period	12,069	4,502
Cash and cash equivalents, end of period	6,892	7,597
Parent Company [Member]
Financing activities:
Borrowings under senior secured revolving credit facility	219,995	77,000
Proceeds from the exercise of options and warrants	23,090	6,032
Excess tax benefit related to share-based compensation	7,314	1,752
Payment of deferred financing costs	(241)	(52)
Repayment under senior secured revolving credit facility	(78,000)	(98,300)
Intercompany notes and investments and other	$ (172,158)	$ 13,568