Note 14 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Statement of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 24,961,000	$ 22,718,000
Investing activities:
Cash paid for acquisitions, net	(187,402,000)
Purchases of building, equipment and leasehold improvements, net	(6,192,000)	(4,758,000)
Working capital and other settlements for acquisitions	(2,366,000)	(569,000)
Proceeds from (payments of) foreign currency net investment hedges	(362,000)	500,000
Other	(939,000)	(332,000)
Net cash used in investing activities	(197,261,000)	(5,159,000)
Financing activities:
Borrowings under senior secured revolving credit facility	269,621,000	103,597,000
Proceeds from the exercise of options and warrants	35,394,000	13,089,000
Excess tax benefit related to share-based compensation	12,700,000	5,974,000
Net borrowings under working capital facilities	7,506,000	215,000
Payment of deferred financing costs	(251,000)	(168,000)
Repayment of subordinated unsecured notes payable	(333,000)	(270,000)
Payment of contingent earnout obligation	(4,362,000)
Repayment under senior secured revolving credit facility	(151,290,000)	(136,301,000)
Intercompany notes and investments and other	(53,000)
	168,932,000	(13,864,000)
Exchange rate impact on cash and cash equivalents	(350,000)	(277,000)
Net increase (decrease) in cash and cash equivalents	(3,718,000)	3,418,000
Cash and cash equivalents, beginning of period	12,829,000	8,627,000
Cash and cash equivalents, end of period	9,111,000	12,045,000
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	18,266,000	13,477,000
Investing activities:
Cash paid for acquisitions, net	(177,864,000)
Purchases of building, equipment and leasehold improvements, net	(4,171,000)	(2,170,000)
Working capital and other settlements for acquisitions	(497,000)	(444,000)
Proceeds from (payments of) foreign currency net investment hedges	(362,000)	500,000
Other	(939,000)	(332,000)
Net cash used in investing activities	(183,833,000)	(2,446,000)
Financing activities:
Repayment of subordinated unsecured notes payable	(333,000)	(270,000)
Intercompany notes and investments and other	166,121,000	(13,693,000)
	165,788,000	(13,963,000)
Net increase (decrease) in cash and cash equivalents	221,000	(2,932,000)
Cash and cash equivalents, beginning of period	760,000	4,125,000
Cash and cash equivalents, end of period	981,000	1,193,000
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	6,695,000	9,241,000
Investing activities:
Cash paid for acquisitions, net	(9,538,000)
Purchases of building, equipment and leasehold improvements, net	(2,021,000)	(2,588,000)
Working capital and other settlements for acquisitions	(1,869,000)	(125,000)
Net cash used in investing activities	(13,428,000)	(2,713,000)
Financing activities:
Net borrowings under working capital facilities	7,506,000	215,000
Payment of deferred financing costs		(116,000)
Payment of contingent earnout obligation	(4,362,000)
	3,144,000	99,000
Exchange rate impact on cash and cash equivalents	(350,000)	(277,000)
Net increase (decrease) in cash and cash equivalents	(3,939,000)	6,350,000
Cash and cash equivalents, beginning of period	12,069,000	4,502,000
Cash and cash equivalents, end of period	8,130,000	10,852,000
Parent Company [Member]
Financing activities:
Borrowings under senior secured revolving credit facility	269,621,000	103,597,000
Proceeds from the exercise of options and warrants	35,394,000	13,089,000
Excess tax benefit related to share-based compensation	12,700,000	5,974,000
Payment of deferred financing costs	(251,000)	(52,000)
Repayment under senior secured revolving credit facility	(151,290,000)	(136,301,000)
Intercompany notes and investments and other	$ (166,174,000)	$ 13,693,000