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Nature of Operations and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018
Bottom of range [Member] |
Disclosure of changes in accounting estimates [Line Items] |
Estimated useful life of property | 30 years
Finite -Lived intangible assets, useful life | 6 years
Capital asset, useful life | 2 years
Bottom of range [Member] | Software [Member] |
Disclosure of changes in accounting estimates [Line Items] |
Finite -Lived intangible assets, useful life | 3 years
Top of range [Member] |
Disclosure of changes in accounting estimates [Line Items] |
Estimated useful life of property | 60 years
Finite -Lived intangible assets, useful life | 68 years
Capital asset, useful life | 10 years
Top of range [Member] | Software [Member] |
Disclosure of changes in accounting estimates [Line Items] |
Finite -Lived intangible assets, useful life | 5 years

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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