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Significant accounting policies - Leases (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019
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Lessee, Lease, Description [Line Items] |  |
Weighted-average remaining lease term, finance lease (in years) | 6 years 15 days |
Right-of-use asset |  | $ 8,295
Lease liabilities (note 1(c)) | $ 10,388 | $ 8,295
Weighted-average discount rate, operating leases | 4.34% |
Weighted-average remaining lease term, operating lease (in years) | 14 years 3 months 4 days |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |
Year 1 | $ 1,840 |
Year 2 | 1,256 |
Year 3 | 669 |
Year 4 | 510 |
Year 5 | 491 |
Thereafter | 4,752 |
Total | 9,518 |
Finance Lease, Liability, Payment, Due [Abstract] |  |
Year 1 | 537 |
Year 2 | 537 |
Year 3 | 537 |
Year 4 | 537 |
Year 5 | 537 |
Thereafter | $ 610 |
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Lease term, renewal period (in years) | 1 year |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Lease term, renewal period (in years) | 5 years |

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