Revenue by Geographic Area and Groups of Similar Products - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenue by geographic area:
Revenue	$ 5,067,220	$ 4,458,036	$ 4,153,945
Messaging
Revenue by geographic area:
Revenue	2,878,304	2,435,462	2,251,308
Messaging | Revision of Prior Period, Reclassification, Adjustment
Revenue by geographic area:
Revenue		76,700	66,600
Voice
Revenue by geographic area:
Revenue	615,655	543,117	511,728
Email
Revenue by geographic area:
Revenue	523,470	488,271	440,185
Segment
Revenue by geographic area:
Revenue	303,250	297,696	295,252
Other
Revenue by geographic area:
Revenue	746,541	693,490	655,472
Other | Revision of Prior Period, Reclassification, Adjustment
Revenue by geographic area:
Revenue		(76,700)	(66,600)
United States
Revenue by geographic area:
Revenue	$ 3,246,863	$ 2,898,056	$ 2,757,470
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Percentage of revenue by geographic area:
Percentage of revenue	64.00%	65.00%	66.00%
International
Revenue by geographic area:
Revenue	$ 1,820,357	$ 1,559,980	$ 1,396,475
International | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Percentage of revenue by geographic area:
Percentage of revenue	36.00%	35.00%	34.00%