Note 3 - Preliminary Allocation of Purchase Price, 2016 (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
2016 Acquisitions [Member] | Customer Relationships [Member]
Intangible assets		$ 32,201
2016 Acquisitions [Member] | Trade Names [Member]
Intangible assets		6,900
2016 Acquisitions [Member]
Equipment and leasehold improvements		1,044
Goodwill		70,378
Net deferred tax liability associated with step-up in book basis		(15,104)
Assets acquired and liabilities assumed, net		4,219
Business Combination, Consideration Transferred		99,638
Goodwill	[1]	$ 581,379	$ 508,297

[1] Goodwill recorded in connection with certain tax benefits to be realized in the Company’s U.S. income tax returns has been reflected in the United States segment.