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Bluegrass Acquisition - Summary of Preliminary Estimated Fair Values of the Assets Acquired and the Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Apr. 30, 2018
Assets:      
Goodwill $ 2,397,483 $ 2,399,118  
Bluegrass Materials Company      
Assets:      
Cash     $ 1,159
Receivables     25,479
Inventory     46,635
Other current assets     1,029
Property, plant and equipment     1,519,289
Intangible assets, other than goodwill     20,150
Goodwill     242,981
Total assets     1,856,722
Liabilities:      
Accounts payable and accrued expenses     17,978
Deferred income tax liabilities, net     212,386
Noncontrolling interest     9,001
Total liabilities     239,365
Total consideration     $ 1,617,357