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Preliminary Fair Values of the Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Business Acquisition [Line Items]    
Lease Right-of-Use Assets $ 26,927 $ 29,483
Lease Obligations (35,896) (40,239)
Goodwill 329,137 $ 331,592
Kosmos Acquisition [Member]    
Business Acquisition [Line Items]    
Inventories 28,568  
Property, Plant, and Equipment 476,698  
Intangible Assets 38,300  
Lease Right-of-Use Assets 4,478  
Lease Obligations (4,478)  
Long-term Liabilities (3,756)  
Total Net Assets 539,810  
Goodwill 129,127  
Total Estimated Purchase Price $ 668,937