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Segment Reporting - Percentage of Revenue by Geographic Area (Detail) - Geographic Concentration Risk - Total Revenue | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 100.00% | 100.00% | 100.00% | 100.00%
North America |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 44.00% | 50.00% | 42.00% | 48.00%
Europe |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 42.00% | 36.00% | 40.00% | 38.00%
APAC/Other |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 14.00% | 14.00% | 18.00% | 14.00%

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