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Revenue - Summary of the Activity in Unearned Revenue in U.K. Facilities (Detail) - U.K. Facilities [Member] - Unearned Revenue [Member]
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Disaggregation of Revenue [Line Items]  
Beginning Balance $ 36,579
Payments received 124,691
Revenue recognized (129,790)
Foreign currency translation loss (850)
Ending Balance $ 30,630