Operating Segment and Enterprise Wide Reporting (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Information about Reportable Segments

The following tables present information about reportable segments (in thousands):

						Project
	Product		Research			Consulting		Consolidated
Year Ended December 31, 2018
Research services revenues
Research	$	157,669	$	—		$	—	$	157,669
Connect		50,820		—			—		50,820
Analytics		19,910		—			—		19,910
Total research services revenues		228,399		—			—		228,399
Advisory services and events revenues
Advisory services		—		41,086			478		41,564
Consulting services		8,649		10,027			55,465		74,141
Events		13,471		—			—		13,471
Total advisory services and events revenues		22,120		51,113			55,943		129,176
Total segment revenues		250,519		51,113			55,943		357,575
Segment expenses		50,551		51,129			27,981		129,661
Contribution margin (loss)		199,968		(16	)		27,962		227,914
Selling, marketing, administrative and other expenses									(200,540	)
Amortization of intangible assets									(1,162	)
Acquisition and integration costs									(3,787	)
Reorganization costs									—
Other income and gains (losses) on investments									1,100
Income before income taxes								$	23,525

						Project
	Product		Research			Consulting		Consolidated
Year Ended December 31, 2017
Research services revenues
Research	$	148,935	$	—		$	—	$	148,935
Connect		48,798		—			—		48,798
Analytics		18,738		—			—		18,738
Total research services revenues		216,471		—			—		216,471
Advisory services and events revenues
Advisory services		—		36,074			320		36,394
Consulting services		10,132		8,980			53,941		73,053
Events		11,755		—			—		11,755
Total advisory services and events revenues		21,887		45,054			54,261		121,202
Total segment revenues		238,358		45,054			54,261		337,673
Segment expenses		45,205		48,812			25,477		119,494
Contribution margin (loss)		193,153		(3,758	)		28,784		218,179
Selling, marketing, administrative and other expenses									(189,849	)
Amortization of intangible assets									(781	)
Acquisition and integration costs									—
Reorganization costs									—
Other income and gains (losses) on investments									(178	)
Income before income taxes								$	27,371

						Project
	Product		Research			Consulting		Consolidated
Year Ended December 31, 2016
Research services revenues
Research	$	147,576	$	—		$	—	$	147,576
Connect		47,291		—			—		47,291
Analytics		20,349		—			—		20,349
Total research services revenues		215,216		—			—		215,216
Advisory services and events revenues
Advisory services		—		34,392			590		34,982
Consulting services		9,547		10,239			45,284		65,070
Events		10,827		—			—		10,827
Total advisory services and events revenues		20,374		44,631			45,874		110,879
Total segment revenues		235,590		44,631			45,874		326,095
Segment expenses		41,528		47,496			23,141		112,165
Contribution margin (loss)		194,062		(2,865	)		22,733		213,930
Selling, marketing, administrative and other expenses									(181,299	)
Amortization of intangible assets									(831	)
Acquisition and integration costs									—
Reorganization costs									(1,026	)
Other income and gains (losses) on investments									(65	)
Income before income taxes								$	30,709

Schedule of Net Long-lived Tangible Assets by Location

Net long-lived tangible assets by location as of December 31, 2018 and 2017 are as follows (in thousands):

	2018		2017
United States	$	20,880	$	23,943
United Kingdom		522		727
Europe (excluding United Kingdom)		83		163
Asia Pacific		517		413
Other		3		3
Total	$	22,005	$	25,249

Schedule of Revenues by Geographic Destination, Based on Location Products and Services and as a Percentage of Total Revenues

Revenues by geographic destination, based on the location products and services are consumed, and as a percentage of total revenues for the years ended December 31, 2018, 2017, and 2016 are as follows (dollars in thousands):

	2018			2017			2016
United States		77	%		77	%		77	%
Europe (excluding United Kingdom)		8			9			8
United Kingdom		4			4			5
Canada		4			4			4
Asia Pacific		5			4			4
Other		2			2			2
Total		100	%		100	%		100	%

	2018		2017		2016
United States	$	274,151	$	260,077	$	252,222
Europe (excluding United Kingdom)		29,741		28,525		27,061
United Kingdom		15,273		13,651		14,808
Canada		15,569		14,523		13,806
Asia Pacific		17,839		15,952		13,686
Other		5,002		4,945		4,512
Total	$	357,575	$	337,673	$	326,095