Employee Benefit Plans - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected contributions to all plans in 2021		$ 2,500,000
Percentage of union employees covered		46.00%
Multiemployer plan expense		$ 18,121,000	$ 17,962,000	$ 17,441,000
Minimum contribution to multiemployer plan		18,300,000
Multi-employer pension plan withdrawal expense	$ 9,200,000
Contributions to government sponsored plan		6,100,000	5,800,000	5,700,000
Defined contribution plan expense		5,700,000	4,200,000	3,900,000
New England Teamsters & Trucking Industry Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer plan expense		456,000	$ 456,000	$ 456,000
Unfunded liability on multiemployer plan		13,700,000
Monthly installments on multiemployer plan		$ 40,000.00
Contribution term of multiemployer plan		30 years
U.S. Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected amortization of estimated net gain (loss)		$ 1,500,000
Expected return on plan assets		6.00%
Offshore Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected amortization of estimated net gain (loss)		$ 0
Expected return on plan assets		5.00%
Pension | Retirement Income Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Average future service period		5 years 9 months 18 days
Expected return on plan assets		6.50%	6.50%	7.00%
Pension | National Service-Related Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Average future service period		6 years 10 months 24 days
Expected return on plan assets		6.50%	6.50%	7.00%
Pension | Superannuation
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Average future service period		5 years 1 month 6 days
Expected return on plan assets		5.00%	5.00%	6.00%
Other Post-Retirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Average future service period		4 years 8 months 12 days