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Leases, User Charges and Commitments - Summary of Other Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Leases [Abstract]      
Operating cash flows from operating leases $ 2,462 $ 7,178  
Financing cash flows from finance leases 741 2,206 $ 2,181
Operating cash flows from finance leases 60 200  
Cash paid for lease liabilities 3,263 9,584  
Right-of-use assets obtained in exchange for new financing lease liabilities   6  
Rights-of-use assets obtained in exchange for new operating lease liabilities $ 7,748 $ 12,736