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Business Combination - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Apr. 27, 2018
Dec. 31, 2017
Jun. 30, 2017
Assets:        
Goodwill $ 2,401,505   $ 2,160,290 $ 2,160,060
Bluegrass Materials Company        
Assets:        
Cash   $ 1,159    
Receivables   30,711    
Inventory   46,785    
Other current assets   1,043    
Property, plant and equipment   1,525,655    
Intangible assets, other than goodwill   19,125    
Goodwill   242,142    
Total assets   1,866,620    
Liabilities:        
Accounts payable and accrued expenses   18,033    
Deferred income tax liabilities, net   217,229    
Noncontrolling interest   9,001    
Total liabilities   244,263    
Total consideration   $ 1,622,357