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Summary of Significant Accounting Policies and Estimates - Self-Insured Medical, Property and Casualty Reserves (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
Insurance Reserves [Line Items]  
Maximum payout $ 0
Exposure for insurance coverage per occurrence 1,000,000
Estimated liability on worker's compensation and general liability claims 19,300,000
Maximum  
Insurance Reserves [Line Items]  
Auto physical damage insurance coverage deductible per occurrence 10,000,000
Maximum aggregate deductible $ 30,000,000