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Fresh Start Accounting - Schedule of Reconciles Reorganization Adjustments Made to Successor's Common Stock and Successor's Additional Paid-in Capital (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Apr. 23, 2021
Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]      
Less: Par value of Successor common stock $ (10)   $ (1,453)
Successor additional paid-in capital $ 945,039   $ 2,029,979
Reorganization Adjustments | Reorganization, Chapter 11, Predecessor, before Adjustment      
Reorganization, Chapter 11 [Line Items]      
Fair value of New Diamond Common Shares issued to holders of Senior Notes Claims   $ 914,236  
Fair value of Emergence Warrants issued to Predecessor equity holders   20,574  
Total change in Successor common stock and additional paid-in capital   934,810  
Less: Par value of Successor common stock   1,453  
Successor additional paid-in capital   934,800  
Common Stock [Member]      
Reorganization, Chapter 11 [Line Items]      
Less: Par value of Successor common stock   (10)  
Common Stock [Member] | Reorganization Adjustments | Reorganization, Chapter 11, Predecessor, before Adjustment      
Reorganization, Chapter 11 [Line Items]      
Less: Par value of Successor common stock   $ (10)