Operating Segments (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Schedule of Information about Reportable Segments

						Project
	Product		Research			Consulting		Consolidated
Three Months Ended March 31, 2017
Research services revenues	$	51,743	$	—		$	—	$	51,743
Advisory services and events revenues		2,501		10,493			12,457		25,451
Total segment revenues		54,244		10,493			12,457		77,194
Segment expenses		9,227		12,143			5,854		27,224
Contribution margin (loss)		45,017		(1,650	)		6,603		49,970
Selling, marketing, administrative and other expenses									(46,643	)
Amortization of intangible assets									(191	)
Reorganization costs									—
Other income (expense) and losses on investments									(194	)
Income before income taxes								$	2,942

						Project
	Product		Research			Consulting		Consolidated
Three Months Ended March 31, 2016
Research services revenues	$	53,248	$	—		$	—	$	53,248
Advisory services and events revenues		2,701		10,377			11,075		24,153
Total segment revenues		55,949		10,377			11,075		77,401
Segment expenses		8,878		12,445			5,865		27,188
Contribution margin (loss)		47,071		(2,068	)		5,210		50,213
Selling, marketing, administrative and other expenses									(46,277	)
Amortization of intangible assets									(209	)
Reorganization costs									(1,015	)
Other income (expense) and losses on investments									(328	)
Income before income taxes								$	2,384