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Commitments and Contingencies - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) employee collective_bargaining_agreement | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |
Rent expense for operating leases and other rental items | $ 191,800 | $ 166,500 | $ 149,000
Sublease rental income | $ 600 | 600 | 600
Number of collective bargaining agreements that are national or regional in scope | collective_bargaining_agreement | 2 |  |
Restructuring expenses | $ 2,306 | 1,577 | 1,438
Restructuring reserve | $ 1,630 | 492 | 201
Minimum |  |  |
Loss Contingencies [Line Items] |  |  |
Number of employees | employee | 33,000 |  |
Number of collective bargaining agreements between our individual subsidiaries and local unions | collective_bargaining_agreement | 400 |  |
Surety Bond [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Aggregate estimated exposure | $ 1,100,000 |  |
Employee Severance [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Restructuring expenses | $ 2,306 | $ 1,600 | $ 1,400
Unionized Employees Concentration Risk [Member] | Workforce Subject to Collective Bargaining Arrangements [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Percentage of employees represented by unions | 57.00% |  |

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