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Leases, User Charges and Commitments - Summary of Lease Costs (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Amortization of finance right-of-use assets $ 590 $ 1,760
Interest on finance lease liabilities 59 200
Finance lease cost 649 1,960
Operating lease cost 2,748 8,060
Short-term lease cost 92 154
Sublease income (124) (442)
Total lease cost $ 3,365 $ 9,732