Note 14 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Statement of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 41,628	$ 24,961
Investing activities:
Cash paid for acquisitions, net	(11,770)	(187,402)
Purchases of equipment and leasehold improvements, net	(7,337)	(6,192)
Working capital and other settlements for acquisitions	(181)	(2,366)
Cash proceeds from (paid for) foreign currency net investment hedge	4,122	(362)
Other	(1,427)	(939)
Net cash used in investing activities	(16,593)	(197,261)
Financing activities:
Borrowings under senior unsecured notes	500,000
Borrowings under senior secured revolving credit facility	25,478	269,621
Proceeds from the exercise of options and warrants	13,737	35,394
Excess tax benefit related to share-based compensation	3,111	12,700
Net borrowings (repayments) under working capital facilities	(607)	7,506
Payment of deferred financing costs	(8,706)	(251)
Payment for early redemption of senior unsecured notes	(14,618)
Repayment of subordinated unsecured notes payable		(333)
Payment of contingent earnout obligation	(5,064)	(4,362)
Repayment under senior secured revolving credit facility	(169,331)	(151,290)
Repayments under senior unsecured notes	(250,000)
Intercompany notes and investments and other		(53)
Net cash provided by (used in) financing activities	94,000	168,932
Exchange rate impact on cash and cash equivalents	(1,448)	(350)
Net increase (decrease) in cash and cash equivalents	117,587	(3,718)
Cash and cash equivalents, beginning of period	9,751	12,829
Cash and cash equivalents, end of period	127,338	9,111
Consolidation, Eliminations [Member]
Financing activities:
Cash and cash equivalents, end of period	0
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	28,717	18,266
Investing activities:
Cash paid for acquisitions, net	(11,145)	(177,864)
Purchases of equipment and leasehold improvements, net	(5,068)	(4,171)
Working capital and other settlements for acquisitions	(181)	(497)
Cash proceeds from (paid for) foreign currency net investment hedge	4,122	(362)
Other	(1,427)	(939)
Net cash used in investing activities	(13,699)	(183,833)
Financing activities:
Repayment of subordinated unsecured notes payable		(333)
Intercompany notes and investments and other	99,815	166,121
Net cash provided by (used in) financing activities	99,815	165,788
Net increase (decrease) in cash and cash equivalents	114,833	221
Cash and cash equivalents, beginning of period	388	760
Cash and cash equivalents, end of period	115,222	981
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	12,911	6,695
Investing activities:
Cash paid for acquisitions, net	(625)	(9,538)
Purchases of equipment and leasehold improvements, net	(2,269)	(2,021)
Working capital and other settlements for acquisitions		(1,869)
Net cash used in investing activities	(2,894)	(13,428)
Financing activities:
Net borrowings (repayments) under working capital facilities	(607)	7,506
Payment of deferred financing costs	(144)
Payment of contingent earnout obligation	(5,064)	(4,362)
Net cash provided by (used in) financing activities	(5,815)	3,144
Exchange rate impact on cash and cash equivalents	(1,448)	(350)
Net increase (decrease) in cash and cash equivalents	2,754	(3,939)
Cash and cash equivalents, beginning of period	9,363	12,069
Cash and cash equivalents, end of period	12,116	8,130
Parent Company [Member]
Financing activities:
Borrowings under senior unsecured notes	500,000
Borrowings under senior secured revolving credit facility	25,478	269,621
Proceeds from the exercise of options and warrants	13,737	35,394
Excess tax benefit related to share-based compensation	3,111	12,700
Payment of deferred financing costs	(8,562)	(251)
Payment for early redemption of senior unsecured notes	(14,618)
Repayment under senior secured revolving credit facility	(169,331)	(151,290)
Repayments under senior unsecured notes	(250,000)
Intercompany notes and investments and other	(99,815)	$ (166,174)
Cash and cash equivalents, end of period	$ 0