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Leases - Schedule of Lease Assets and Related Lease Liabilities (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Leases [Abstract] |  |
Right-of-use assets - cost | $ 49,676 |
Accumulated amortization | (5,140) |
Finance lease right-of-use assets, net | 44,536 | $ 0
Right-of-use assets - cost | 1,212 |
Accumulated amortization | (273) |
Operating lease right-of-use assets, net | 939 |
Total lease assets | 45,475 |
Finance lease liabilities | 12,071 | 0
Operating lease liabilities | 591 |
Finance lease liabilities | 43,780 | $ 0
Operating lease liabilities | 346 |
Total lease liabilities | $ 56,788 |

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