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Business Combination - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Apr. 27, 2018
Dec. 31, 2017
Sep. 30, 2017
Assets:        
Goodwill $ 2,399,434   $ 2,160,290 $ 2,160,060
Bluegrass Materials Company        
Assets:        
Cash   $ 1,159    
Receivables   25,479    
Inventory   46,156    
Other current assets   1,029    
Property, plant and equipment   1,522,386    
Intangible assets, other than goodwill   19,125    
Goodwill   239,360    
Total assets   1,854,694    
Liabilities:        
Accounts payable and accrued expenses   17,893    
Deferred income tax liabilities, net   210,443    
Noncontrolling interest   9,001    
Total liabilities   237,337    
Total consideration   $ 1,617,357