Business Segments - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	3
Segment Reporting Information [Line Items]
Service revenues	$ 1,398,380	$ 1,506,691
Elimination of intersegment revenues
Segment Reporting Information [Line Items]
Service revenues	$ (103,818)	$ (46,273)