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Revenue - Schedule of Revenues Disaggregated by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Disaggregation Of Revenue [Line Items]
Revenues	$ 408,223	$ 329,063
North America
Disaggregation Of Revenue [Line Items]
Revenues	279,179	232,731
Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues	82,531	57,416
United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues	30,284	23,998
Other
Disaggregation Of Revenue [Line Items]
Revenues	16,229	14,918
Meeting Fees
Disaggregation Of Revenue [Line Items]
Revenues	190,122	164,352
Meeting Fees | North America
Disaggregation Of Revenue [Line Items]
Revenues	140,152	124,000
Meeting Fees | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues	29,080	21,965
Meeting Fees | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues	14,382	12,114
Meeting Fees | Other
Disaggregation Of Revenue [Line Items]
Revenues	6,508	6,273
Online Subscription Services
Disaggregation Of Revenue [Line Items]
Revenues	138,547	97,124
Online Subscription Services | North America
Disaggregation Of Revenue [Line Items]
Revenues	92,240	68,147
Online Subscription Services | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues	36,161	21,542
Online Subscription Services | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues	6,563	4,455
Online Subscription Services | Other
Disaggregation Of Revenue [Line Items]
Revenues	3,583	2,980
Service revenues, net
Disaggregation Of Revenue [Line Items]
Revenues	328,669	261,476
Service revenues, net | North America
Disaggregation Of Revenue [Line Items]
Revenues	232,392	192,147
Service revenues, net | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues	65,241	43,507
Service revenues, net | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues	20,945	16,569
Service revenues, net | Other
Disaggregation Of Revenue [Line Items]
Revenues	10,091	9,253
Product sales and other, net
Disaggregation Of Revenue [Line Items]
Revenues	79,554	67,587
Product sales and other, net | North America
Disaggregation Of Revenue [Line Items]
Revenues	46,787	40,584
Product sales and other, net | Continental Europe
Disaggregation Of Revenue [Line Items]
Revenues	17,290	13,909
Product sales and other, net | United Kingdom
Disaggregation Of Revenue [Line Items]
Revenues	9,339	7,429
Product sales and other, net | Other
Disaggregation Of Revenue [Line Items]
Revenues	$ 6,138	$ 5,665

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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