Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2021
Transportation Equipment [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property and equipment, useful life	3 years
Transportation Equipment [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property and equipment, useful life	15 years
Other Operating Assets [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property and equipment, useful life	3 years
Other Operating Assets [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property and equipment, useful life	15 years
Information Technology Equipment [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property and equipment, useful life	3 years
Information Technology Equipment [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property and equipment, useful life	5 years
Buildings and Related Assets [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property and equipment, useful life	10 years
Buildings and Related Assets [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property and equipment, useful life	39 years