Operating Segment and Enterprise Wide Reporting (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Schedule of Information about Reportable Segments

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

						Project
	Products		Research			Consulting		Consolidated
Year Ended December 31, 2015
Research services revenues	$	210,268	$	—		$	—	$	210,268
Advisory services and events revenues		17,512		42,997			42,949		103,458
Total segment revenues		227,780		42,997			42,949		313,726
Segment expenses		38,615		51,510			27,320		117,445
Contribution margin (loss)		189,165		(8,513	)		15,629		196,281
Selling, marketing, administrative and other expenses									(172,130	)
Amortization of intangible assets									(891	)
Reorganization costs									(4,433	)
Other income and losses on investments									493
Income before income taxes								$	19,320

						Project
	Products		Research			Consulting		Consolidated
Year Ended December 31, 2014
Research services revenues	$	207,517	$	—		$	—	$	207,517
Advisory services and events revenues		20,759		48,658			35,128		104,545
Total segment revenues		228,276		48,658			35,128		312,062
Segment expenses		39,466		53,307			27,236		120,009
Contribution margin (loss)		188,810		(4,649	)		7,892		192,053
Selling, marketing, administrative and other expenses									(169,852	)
Amortization of intangible assets									(2,171	)
Reorganization costs									(1,817	)
Other income and losses on investments									176
Income before income taxes								$	18,389

						Project
	Products		Research			Consulting		Consolidated
Year Ended December 31, 2013
Research services revenues	$	202,843	$	—		$	—	$	202,843
Advisory services and events revenues		19,376		57,865			17,566		94,807
Total segment revenues		222,219		57,865			17,566		297,650
Segment expenses		36,384		58,685			15,700		110,769
Contribution margin (loss)		185,835		(820	)		1,866		186,881
Selling, marketing, administrative and other expenses									(160,913	)
Amortization of intangible assets									(2,230	)
Reorganization costs									(1,905	)
Other income and losses on investments									(1,841	)
Income before income taxes								$	19,992

Schedule of Net Long-lived Tangible Assets by Location

Net long-lived tangible assets by location as of December 31, 2015 and 2014 are as follows (in thousands):

	2015		2014
United States	$	24,914	$	28,558
United Kingdom		1,176		1,625
Europe (excluding United Kingdom)		381		329
Other		1,098		1,662
Total	$	27,569	$	32,174

Schedule of Net Revenues by Geographic Destination and as a Percentage of Total Revenues

Net revenues by geographic destination and as a percentage of total revenues for the years ended December 31, 2015, 2014, and 2013 are as follows (in thousands):

	2015		2014		2013
United States	$	241,025	$	232,440	$	218,900
Europe (excluding United Kingdom)		24,607		30,257		30,956
United Kingdom		16,815		16,804		16,293
Canada		14,424		17,089		16,995
Other		16,855		15,472		14,506
Total	$	313,726	$	312,062	$	297,650

	2015			2014			2013
United States		77	%		74	%		74	%
Europe (excluding United Kingdom)		8	%		10	%		10	%
United Kingdom		5	%		5	%		5	%
Canada		5	%		6	%		6	%
Other		5	%		5	%		5	%
Total		100	%		100	%		100	%