Business Segments - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Segment Reporting Information [Line Items]
Service revenues	$ 1,580,581	$ 1,108,326	$ 2,978,961	$ 2,615,017
Elimination of Intersegment Revenues
Segment Reporting Information [Line Items]
Service revenues	$ (143,036)	$ (41,514)	$ (246,840)	$ (87,786)