Commitments and Contingencies - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2020	Apr. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Contingencies And Commitments [Line Items]
Estimated sales tax and related penalties and interest	$ 12,400,000			$ 16,100,000
Deductible for marine liability coverage including personal injury claims, per first occurrence	5,000,000.0
Range of deductible for liability coverage for personal injury claims, lower limit	5,000,000.0
Range of deductible for liability coverage for personal injury claims, upper limit	100,000,000.0
Total Contingent Liabilities Under Letters of Credit and Bonds [Member]
Contingencies And Commitments [Line Items]
Contingent liability under letters of credit and other bonds	31,200,000
Potentially Collateralized Contingent Liability Under Letters Of Credit and Bonds [Member]
Contingencies And Commitments [Line Items]
Contingent liability under letters of credit and other bonds	22,900,000
Uncollateralized Contingent Liability Under Letters of Credit and Bonds [Member]
Contingencies And Commitments [Line Items]
Contingent liability under letters of credit and other bonds	8,300,000
Collateralized Contingent Liability Under Financial Letters of Credit and Surety Bond [Member]
Contingencies And Commitments [Line Items]
Contingent liability under letters of credit and other bonds			$ 6,000,000.0
Cash Collateralized Contingent Liability Under Letters of Credit and Bonds [Member]
Contingencies And Commitments [Line Items]
Contingent liability under letters of credit and other bonds		$ 17,500,000
Windstorms in U.S. Gulf of Mexico [Member]
Contingencies And Commitments [Line Items]
Deductible for marine liability coverage including personal injury claims, per first occurrence	25,000,000.0
Range of deductible for liability coverage for personal injury claims, lower limit	25,000,000.0
Range of deductible for liability coverage for personal injury claims, upper limit	100,000,000.0
Personal Injury Claims [Member]
Contingencies And Commitments [Line Items]
Personal injury claims recorded	14,800,000			17,400,000
Personal Injury Claims [Member] | Accrued Liabilities [Member]
Contingencies And Commitments [Line Items]
Personal injury claims recorded	6,200,000			6,400,000
Personal Injury Claims [Member] | Other Liabilities [Member]
Contingencies And Commitments [Line Items]
Personal injury claims recorded	$ 8,600,000			$ 11,000,000.0