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Related Party Transaction - Schedule of Carrying Value of Finance Lease Obligations to Related Parties (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Related Party [Line Items]    
Finance lease obligations with subsidiary of The Modern Group, Ltd $ 648  
Less: amounts due within one year (648) $ (3,440)
Total long term finance lease obligations to related parties 0 648
The Modern Group Ltd    
Schedule Of Related Party [Line Items]    
Finance lease obligations with subsidiary of The Modern Group, Ltd $ 648 $ 4,088