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Operating Segment and Enterprise Wide Reporting - Schedule of Information about Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 98,583	$ 84,890	$ 96,353	$ 77,749	$ 90,377	$ 80,369	$ 89,733	$ 77,194	$ 357,575	$ 337,673	$ 326,095
Segment expenses									129,661	119,494	112,165
Contribution margin (loss)									227,914	218,179	213,930
Selling, marketing, administrative and other expenses									(200,540)	(189,849)	(181,299)
Amortization of intangible assets									(1,162)	(781)	(831)
Acquisition and integration costs									(3,787)
Reorganization costs											(1,026)
Other income and gains (losses) on investments									1,100	(178)	(65)
Income before income taxes									23,525	27,371	30,709
Research [Member]
Segment Reporting Information [Line Items]
Total revenues									157,669	148,935	147,576
Connect [Member]
Segment Reporting Information [Line Items]
Total revenues									50,820	48,798	47,291
Analytics [Member]
Segment Reporting Information [Line Items]
Total revenues									19,910	18,738	20,349
Research Services [Member]
Segment Reporting Information [Line Items]
Total revenues									228,399	216,471	215,216
Advisory Services [Member]
Segment Reporting Information [Line Items]
Total revenues									41,564	36,394	34,982
Consulting Services [Member]
Segment Reporting Information [Line Items]
Total revenues									74,141	73,053	65,070
Events [Member]
Segment Reporting Information [Line Items]
Total revenues									13,471	11,755	10,827
Advisory Services and Events [Member]
Segment Reporting Information [Line Items]
Total revenues									129,176	121,202	110,879
Product Organization [Member]
Segment Reporting Information [Line Items]
Total revenues									250,519	238,358	235,590
Segment expenses									50,551	45,205	41,528
Contribution margin (loss)									199,968	193,153	194,062
Product Organization [Member] | Research [Member]
Segment Reporting Information [Line Items]
Total revenues									157,669	148,935	147,576
Product Organization [Member] | Connect [Member]
Segment Reporting Information [Line Items]
Total revenues									50,820	48,798	47,291
Product Organization [Member] | Analytics [Member]
Segment Reporting Information [Line Items]
Total revenues									19,910	18,738	20,349
Product Organization [Member] | Research Services [Member]
Segment Reporting Information [Line Items]
Total revenues									228,399	216,471	215,216
Product Organization [Member] | Consulting Services [Member]
Segment Reporting Information [Line Items]
Total revenues									8,649	10,132	9,547
Product Organization [Member] | Events [Member]
Segment Reporting Information [Line Items]
Total revenues									13,471	11,755	10,827
Product Organization [Member] | Advisory Services and Events [Member]
Segment Reporting Information [Line Items]
Total revenues									22,120	21,887	20,374
Research Organization [Member]
Segment Reporting Information [Line Items]
Total revenues									51,113	45,054	44,631
Segment expenses									51,129	48,812	47,496
Contribution margin (loss)									(16)	(3,758)	(2,865)
Research Organization [Member] | Advisory Services [Member]
Segment Reporting Information [Line Items]
Total revenues									41,086	36,074	34,392
Research Organization [Member] | Consulting Services [Member]
Segment Reporting Information [Line Items]
Total revenues									10,027	8,980	10,239
Research Organization [Member] | Advisory Services and Events [Member]
Segment Reporting Information [Line Items]
Total revenues									51,113	45,054	44,631
Project Consulting [Member]
Segment Reporting Information [Line Items]
Total revenues									55,943	54,261	45,874
Segment expenses									27,981	25,477	23,141
Contribution margin (loss)									27,962	28,784	22,733
Project Consulting [Member] | Advisory Services [Member]
Segment Reporting Information [Line Items]
Total revenues									478	320	590
Project Consulting [Member] | Consulting Services [Member]
Segment Reporting Information [Line Items]
Total revenues									55,465	53,941	45,284
Project Consulting [Member] | Advisory Services and Events [Member]
Segment Reporting Information [Line Items]
Total revenues									$ 55,943	$ 54,261	$ 45,874

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