Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 415,379	$ 280,923
Finite-lived intangible assets, Accumulated Amortization	110,772	83,537
Finite-lived intangible assets, Net Carrying Value	304,607	197,386
Customer Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	376,956	249,223
Finite-lived intangible assets, Accumulated Amortization	92,827	72,157
Finite-lived intangible assets, Net Carrying Value	$ 284,129	$ 177,066
Customer Relationships [Member] | Minimum [Member]
Other Intangible Assets [Line Items]
Intangible assets estimated useful life	5 years	5 years
Customer Relationships [Member] | Maximum [Member]
Other Intangible Assets [Line Items]
Intangible assets estimated useful life	15 years	15 years
Carrier Network and Agent Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 15,000	$ 15,000
Finite-lived intangible assets, Accumulated Amortization	8,563	4,813
Finite-lived intangible assets, Net Carrying Value	$ 6,437	$ 10,187
Intangible assets estimated useful life	4 years	4 years
Developed Technology [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 17,223	$ 10,500
Finite-lived intangible assets, Accumulated Amortization	3,247	1,449
Finite-lived intangible assets, Net Carrying Value	$ 13,976	$ 9,051
Developed Technology [Member] | Minimum [Member]
Other Intangible Assets [Line Items]
Intangible assets estimated useful life	4 years	4 years
Developed Technology [Member] | Maximum [Member]
Other Intangible Assets [Line Items]
Intangible assets estimated useful life	7 years	7 years
Trade Name [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 6,200	$ 6,200
Finite-lived intangible assets, Accumulated Amortization	6,135	5,118
Finite-lived intangible assets, Net Carrying Value	$ 65	$ 1,082
Intangible assets estimated useful life	18 years	18 years