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Revenue - Summary of the Activity in Unearned Revenue (Detail) - U.K. Facilities [Member] - Unearned Revenue [Member]
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Disaggregation of Revenue [Line Items]  
Beginning Balance $ 31,239
Payments received 48,216
Revenue recognized (39,736)
Foreign currency translation gain 480
Ending Balance $ 40,199