Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 253,623	$ 202,159
Finite-lived intangible assets, Accumulated Amortization	(56,951)	(38,206)
Finite-lived intangible assets, Net Carrying Value	196,672	163,953
Customer Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	226,623	196,806
Finite-lived intangible assets, Accumulated Amortization	(53,156)	(36,765)
Finite-lived intangible assets, Net Carrying Value	$ 173,467	$ 160,041
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	$ 2,432
Finite-lived intangible assets, Accumulated Amortization	(1,063)	(51)
Finite-lived intangible assets, Net Carrying Value	$ 13,937	$ 2,381
Intangible assets estimated useful life	4 years	4 years
Developed Technology [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 6,500
Finite-lived intangible assets, Accumulated Amortization	(232)
Finite-lived intangible assets, Net Carrying Value	$ 6,268
Intangible assets estimated useful life	7 years
Trade Name [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 5,500	$ 2,921
Finite-lived intangible assets, Accumulated Amortization	(2,500)	(1,390)
Finite-lived intangible assets, Net Carrying Value	$ 3,000	$ 1,531
Intangible assets estimated useful life	18 months	18 months