Business Segments - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Segment Reporting Information [Line Items]
Service revenues	$ (1,189,897)	$ (1,552,132)	$ (3,804,914)	$ (4,537,047)
Elimination of intersegment revenues
Segment Reporting Information [Line Items]
Service revenues	$ 59,816	$ 46,518	$ 147,603	$ 121,555