Operating Segments (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Schedule of Information about Reportable Segments

						Project
	Products		Research			Consulting		Consolidated
Three Months Ended September 30, 2016
Research services revenues	$	52,727	$	—		$	—	$	52,727
Advisory services and events revenues		2,333		10,643			11,724		24,700
Total segment revenues		55,060		10,643			11,724		77,427
Segment expenses		8,884		12,548			6,237		27,669
Contribution margin (loss)		46,176		(1,905	)		5,487		49,758
Selling, marketing, administrative and other expenses									(41,998	)
Amortization of intangible assets									(208	)
Reorganization costs									—
Other income (expense) and gains (losses) on investments									(856	)
Income before income taxes								$	6,696

						Project
	Products		Research			Consulting		Consolidated
Three Months Ended September 30, 2015
Research services revenues	$	52,205	$	—		$	—	$	52,205
Advisory services and events revenues		2,041		9,804			10,703		22,548
Total segment revenues		54,246		9,804			10,703		74,753
Segment expenses		7,918		12,711			6,811		27,440
Contribution margin (loss)		46,328		(2,907	)		3,892		47,313
Selling, marketing, administrative and other expenses									(40,820	)
Amortization of intangible assets									(224	)
Reorganization costs									(928	)
Other income (expense) and gains (losses) on investments									404
Income before income taxes								$	5,745

						Project
	Products		Research			Consulting		Consolidated
Nine Months Ended September 30, 2016
Research services revenues	$	160,998	$	—		$	—	$	160,998
Advisory services and events revenues		14,191		33,905			33,555		81,651
Total segment revenues		175,189		33,905			33,555		242,649
Segment expenses		30,306		38,707			20,039		89,052
Contribution margin (loss)		144,883		(4,802	)		13,516		153,597
Selling, marketing, administrative and other expenses									(130,208	)
Amortization of intangible assets									(627	)
Reorganization costs									(1,026	)
Other income (expense) and gains (losses) on investments									(765	)
Income before income taxes								$	20,971

						Project
	Products		Research			Consulting		Consolidated
Nine Months Ended September 30, 2015
Research services revenues	$	156,667	$	—		$	—	$	156,667
Advisory services and events revenues		12,763		31,454			31,867		76,084
Total segment revenues		169,430		31,454			31,867		232,751
Segment expenses		27,799		38,467			20,544		86,810
Contribution margin (loss)		141,631		(7,013	)		11,323		145,941
Selling, marketing, administrative and other expenses									(126,120	)
Amortization of intangible assets									(669	)
Reorganization costs									(4,433	)
Other income (expense) and gains (losses) on investments									578
Income before income taxes								$	15,297