Summary of Significant Accounting Policies - Insurance (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)
Accounting Policies [Abstract]
Employer's liability claims subject to deductible per occurrence	$ 1,000,000.0
Worker's compensation claims per occurrence	5,000,000.0
Auto liability insurance claims deductible	10,000,000.0
General liability insurance claims deductible	10,000,000
Employee health care benefit plans subject to deductible per claimant	$ 500,000