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Commitments and Contingencies (Narrative) (Detail)
T in Millions
 6 Months Ended 7 Months Ended 12 Months Ended
Aug. 10, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jul. 25, 2017
USD ($)
Dec. 31, 2016
T
Dec. 31, 2014
USD ($)
Contingencies And Commitments [Line Items]            
Estimated clean up costs           $ 342,000,000
Bridge and Thoroughfare Fee [Member]            
Contingencies And Commitments [Line Items]            
Loss contingency amount sought     $ 83,000 $ 11,600,000    
Noncompliance fee     $ 750      
Fee paid $ 11,600,000          
Chiquita Canyon, LLC [Member]            
Contingencies And Commitments [Line Items]            
Annual tons of waste accepted at landfill | T         3  
Estimate of total new fees and other new taxes over the life of the conditional use permit   $ 300,000,000        
Environmental Remediation Expense [Member]            
Contingencies And Commitments [Line Items]            
Estimated period to implement clean-up   seven years        
Required period of monitoring following the clean-up   10 years        
Penalties [Member] | Bridge and Thoroughfare Fee [Member]            
Contingencies And Commitments [Line Items]            
Fee paid 83,000          
Fees [Member] | Bridge and Thoroughfare Fee [Member]            
Contingencies And Commitments [Line Items]            
Fee paid $ 750