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Commitments and Contingencies (Narrative) (Detail)
$ in Thousands, T in Millions
 3 Months Ended 9 Months Ended 12 Months Ended 156 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
T
Sep. 30, 2017
Oct. 20, 2017
USD ($)
Dec. 02, 2014
USD ($)
Contingencies And Commitments [Line Items]            
Estimated clean up costs           $ 342,000
Duration of extension of conditional use permit extension 30 years          
Chiquita Canyon, LLC [Member]            
Contingencies And Commitments [Line Items]            
Annual tons of waste accepted at landfill | T     3      
Duration of permitting and environmental impact review for conditional use permit to authorize continued operation and expansion of landfill       12 years 6 months    
Environmental Remediation Expense [Member]            
Contingencies And Commitments [Line Items]            
Estimated period to implement cleanup remedy   7 years        
Required period of monitoring following the clean-up   10 years        
Subsequent Event [Member] | Scenario, Forecast [Member]            
Contingencies And Commitments [Line Items]            
Estimate of total new fees and other new taxes over the life of the conditional use permit         $ 250,000