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Revenue - Schedule of Revenues Disaggregated by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 409,747 | $ 341,673 | $ 817,970 | $ 670,736
North America |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 284,538 | 238,989 | 563,715 | 471,719
Continental Europe |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 81,592 | 61,496 | 164,123 | 118,914
United Kingdom |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 29,210 | 26,435 | 59,495 | 50,434
Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 14,407 | 14,753 | 30,637 | 29,669
Meeting Fees |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 192,712 | 175,003 | 382,834 | 339,355
Meeting Fees | North America |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 142,767 | 129,666 | 282,918 | 253,665
Meeting Fees | Continental Europe |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 29,402 | 24,798 | 58,482 | 46,764
Meeting Fees | United Kingdom |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 14,551 | 14,028 | 28,933 | 26,141
Meeting Fees | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 5,992 | 6,511 | 12,500 | 12,785
Online Subscription Services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 151,018 | 107,998 | 289,565 | 205,122
Online Subscription Services | North America |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 101,099 | 73,535 | 193,339 | 141,682
Online Subscription Services | Continental Europe |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 39,342 | 25,701 | 75,503 | 47,243
Online Subscription Services | United Kingdom |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 6,955 | 5,745 | 13,519 | 10,200
Online Subscription Services | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 3,622 | 3,017 | 7,205 | 5,997
Service revenues, net |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 343,730 | 283,001 | 672,399 | 544,477
Service revenues, net | North America |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 243,866 | 203,201 | 476,257 | 395,347
Service revenues, net | Continental Europe |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 68,744 | 50,499 | 133,985 | 94,007
Service revenues, net | United Kingdom |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 21,506 | 19,773 | 42,452 | 36,341
Service revenues, net | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 9,614 | 9,528 | 19,705 | 18,782
Product sales and other, net |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 66,017 | 58,672 | 145,571 | 126,259
Product sales and other, net | North America |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 40,672 | 35,788 | 87,458 | 76,372
Product sales and other, net | Continental Europe |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 12,848 | 10,997 | 30,138 | 24,907
Product sales and other, net | United Kingdom |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 7,704 | 6,662 | 17,043 | 14,093
Product sales and other, net | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 4,793 | $ 5,225 | $ 10,932 | $ 10,887

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