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Revenue - Schedule of Revenues Disaggregated by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
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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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