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Leases - Schedule of Lease Assets and Related Lease Liabilities (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Leases [Abstract] |  |
Right-of-use assets - cost | $ 49,598 |
Accumulated amortization | (2,569) |
Finance lease right-of-use assets, net | 47,029 | $ 0
Right-of-use assets - cost | 730 |
Accumulated amortization | (122) |
Operating lease right-of-use assets, net | 608 |
Total lease assets | 47,637 |
Finance lease liabilities | 11,766 | 0
Operating lease liabilities | 436 |
Finance lease liabilities | 46,818 | $ 0
Operating lease liabilities | 129 |
Total lease liabilities | $ 59,149 |

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