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Commitments and Contingencies - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
employee
collective_bargaining_agreement
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loss Contingencies [Line Items]      
Rent expense for operating leases and other rental items $ 143,100 $ 122,000 $ 118,400
Sublease rental income $ 600 1,200 1,300
Number of collective bargaining agreements that are national or regional in scope | collective_bargaining_agreement 2    
Restructuring expenses $ 1,438 824 1,168
Restructuring reserve $ 201 81 281
Minimum      
Loss Contingencies [Line Items]      
Number of employees | employee 31,000    
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 1,438 900 600
Facility Closing [Member]      
Loss Contingencies [Line Items]      
Restructuring expenses $ 0   $ 600
Reversal of restructuring expenses   $ (100)  
Unionized Employees Concentration Risk [Member] | Workforce Subject to Collective Bargaining Arrangements [Member]      
Loss Contingencies [Line Items]      
Percentage of employees represented by unions 55.00%