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Summary of Significant Accounting Policies (Property and Equipment) (Details)
12 Months Ended
Dec. 31, 2016
Buildings and improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 7 years
Buildings and improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 40 years
Vehicles | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 5 years
Vehicles | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 12 years
Landfill equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 5 years
Landfill equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 7 years
Other equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 3 years
Other equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 20 years
Furniture and fixtures  
Property, Plant and Equipment [Line Items]  
Estimated useful life 10 years