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Commitments and Contingencies - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) employee collective_bargaining_agreement | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |
Rent expense for operating leases and other rental items | $ 158,800 | $ 143,100 | $ 122,000
Sublease rental income | $ 600 | 600 | 1,200
Number of collective bargaining agreements that are national or regional in scope | collective_bargaining_agreement | 2 |  |
Restructuring expenses | $ 1,577 | 1,438 | 824
Restructuring reserve | $ 492 | $ 201 | $ 81
Minimum |  |  |
Loss Contingencies [Line Items] |  |  |
Number of employees | employee | 32,000 |  |
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 | $ 927,300 |  |
Employee Severance [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Restructuring expenses | 1,516 |  |
Facility Closing [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Restructuring expenses | $ 61 |  |
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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