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Revenue - Summary of the Activity in Unearned Revenue in U.S. Facilities (Detail) - U.S. Facilities [Member] - Unearned Revenue [Member]
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Disaggregation of Revenue [Line Items]  
Beginning Balance $ 1,896
Payments received 49,332
Revenue recognized (3,366)
Ending Balance $ 47,862