Note 14 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Balance Sheet - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents		$ 47,865	$ 9,751	$ 12,829	$ 8,627
Accounts receivable, net		245,449	203,189
Prepaid expenses		16,809	13,805
Deferred tax assets			3,776
Other current assets		1,958	1,437
Total current assets		312,081	231,958
Property, equipment and leasehold improvements, net		20,145	15,726
Goodwill	[1]	508,297	495,679	369,312
Intangible assets, net		84,673	102,583
Long-term accounts receivable, less current portion		62,717	46,401
Deferred tax assets, noncurrent		50,405	29,682
Deferred financing costs, net		9,394	6,169
Other assets		3,969	1,946
Total assets	[2]	1,051,681	930,144	732,513
Current liabilities:
Accounts payable		60,599	57,033
Accrued expenses		60,748	53,978
Accrued interest expense		6,245	10,667
Deferred revenue		3,684	6,402
Current portion of contingent earnout obligation			4,473
Current portion of working capital facilities			40,396
Other current liabilities		9,056	6,950
Total current liabilities		140,332	179,899
Senior unsecured notes payable		500,000	250,000
Senior secured revolving credit facility		35,243	143,853
Deferred tax liability, noncurrent		3,333
Long-term contingent earnout obligation, less current portion			2,114
Other long-term liabilities		12,738	9,403
Total liabilities		$ 691,646	$ 585,269
Commitments and contingencies
Stockholders’ equity (deficit)		$ 360,035	$ 344,875	272,871	244,148
Total liabilities and stockholders' equity (deficit)		1,051,681	930,144
Consolidation, Eliminations [Member]
Current assets:
Intercompany receivable		(63,639)	(52,669)
Deferred tax assets			(4)
Total current assets		(63,639)	(52,673)
Investment in subsidiaries		(1,080,857)	(808,779)
Intercompany notes receivable		(348,842)	(348,928)
Total assets		(1,493,338)	(1,210,380)
Current liabilities:
Intercompany payable		(63,639)	(52,669)
Deferred tax liability			(4)
Total current liabilities		(63,639)	(52,673)
Intercompany notes payable		(348,842)	(348,928)
Total liabilities		$ (412,481)	$ (401,601)
Commitments and contingencies
Stockholders’ equity (deficit)		$ (1,080,857)	$ (808,779)
Total liabilities and stockholders' equity (deficit)		(1,493,338)	(1,210,380)
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents		33,011	388	760	4,125
Accounts receivable, net		68,896	55,684
Intercompany receivable		57,394	42,002
Prepaid expenses		10,398	8,248
Deferred tax assets			3,780
Other current assets		848	272
Total current assets		170,547	110,374
Property, equipment and leasehold improvements, net		12,695	10,394
Investment in subsidiaries		280,114	217,344
Intercompany notes receivable		174,421	174,464
Goodwill		398,045	387,104
Intangible assets, net		46,423	64,530
Deferred tax assets, noncurrent		47,363	22,505
Deferred financing costs, net		9,290	6,140
Other assets		725	663
Total assets		1,139,623	993,518
Current liabilities:
Accounts payable		24,072	20,163
Intercompany payable		6,245	10,667
Accrued expenses		13,150	23,904
Deferred revenue		138	244
Other current liabilities		3,383	2,363
Total current liabilities		46,988	57,341
Intercompany notes payable		174,421	174,464
Other long-term liabilities		2,950	1,795
Total liabilities		$ 224,359	$ 233,600
Commitments and contingencies
Stockholders’ equity (deficit)		$ 915,264	$ 759,918
Total liabilities and stockholders' equity (deficit)		1,139,623	993,518
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents		14,854	9,363	$ 12,069	$ 4,502
Accounts receivable, net		176,553	147,505
Prepaid expenses		6,411	5,557
Other current assets		1,110	1,165
Total current assets		198,928	163,590
Property, equipment and leasehold improvements, net		7,450	5,332
Goodwill		110,252	108,575
Intangible assets, net		38,250	38,053
Long-term accounts receivable, less current portion		62,717	46,401
Deferred tax assets, noncurrent		3,042	7,177
Deferred financing costs, net		104	29
Other assets		3,244	1,283
Total assets		423,987	370,440
Current liabilities:
Accounts payable		36,527	36,870
Intercompany payable		57,394	42,002
Accrued expenses		47,598	30,074
Deferred revenue		3,546	6,158
Deferred tax liability			4
Current portion of contingent earnout obligation			4,473
Current portion of working capital facilities			40,396
Other current liabilities		5,673	4,587
Total current liabilities		150,738	164,564
Senior secured revolving credit facility		35,243
Intercompany notes payable		174,421	174,464
Deferred tax liability, noncurrent		3,333
Long-term contingent earnout obligation, less current portion			2,114
Other long-term liabilities		9,788	7,608
Total liabilities		$ 373,523	$ 348,750
Commitments and contingencies
Stockholders’ equity (deficit)		$ 50,464	$ 21,690
Total liabilities and stockholders' equity (deficit)		423,987	370,440
Parent Company [Member]
Current assets:
Intercompany receivable		6,245	10,667
Total current assets		6,245	10,667
Investment in subsidiaries		800,743	591,435
Intercompany notes receivable		174,421	174,464
Total assets		981,409	776,566
Current liabilities:
Accrued interest expense		6,245	10,667
Total current liabilities		6,245	10,667
Senior unsecured notes payable		500,000	250,000
Senior secured revolving credit facility			143,853
Total liabilities		$ 506,245	$ 404,520
Commitments and contingencies
Stockholders’ equity (deficit)		$ 475,164	$ 372,046
Total liabilities and stockholders' equity (deficit)		$ 981,409	$ 776,566

[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.

[2] Total assets and long-lived assets include goodwill. 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.