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Lease Arrangements - Summary of Future Minimum Lease Payments of Non-Cancellable Operating Lease Commitments (Detail) - Dec. 31, 2018 $ in Thousands, $ in Thousands | TWD ($) | USD ($)
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Disclosure of finance lease and operating lease by lessee [line items] |  |
Future minimum lease payments of non-cancellable operating lease commitments | $ 2,386,102 | $ 79,776
Less than 1 year [member] |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Future minimum lease payments of non-cancellable operating lease commitments | 509,994 |
1-5 years [member] |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Future minimum lease payments of non-cancellable operating lease commitments | 828,482 |
More than 5 years [member] |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Future minimum lease payments of non-cancellable operating lease commitments | $ 1,047,626 |

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