Significant Accounting Policies - Summary of Basis Depreciation of Property, Plant and Equipment (Detail)
|
12 Months Ended |
Dec. 31, 2017 |
|---|
| Building structures [member] |
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
| Method |
Straight-line
|
| Rate |
15 to 20 years
|
| Furniture and equipment [member] |
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
| Method |
Straight-line
|
| Rate |
5 years
|
| Computer equipment [member] |
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
| Method |
Straight-line
|
| Rate |
3 years
|
| Security equipment [member] |
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
| Method |
Straight-line
|
| Rate |
5 years
|
| Road [member] |
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
| Method |
Straight-line
|
| Rate |
25 years
|
| Production equipment [member] |
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
| Method |
Straight-line
|
| Rate |
7 years
|
| Leasehold improvements [member] |
|
| Disclosure of detailed information about property, plant and equipment [line items] |
|
| Method |
Straight-line
|
| Rate |
5 to 10 years
|