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Insurance Recoveries On Impairment And Related Losses Due To Earthquake (Allocation Of The Total Insurance Proceeds To The Various Risks and Bases) (Details) - NZD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Insurance Recoveries [Line Items] |  |
Basis for Allocation | $ 55,499 |
Percentage Allocation | 100.00% |
Allocation of Insurance Proceeds | $ 36,034 | $ 36,034
Property Damage [Member] |  |
Insurance Recoveries [Line Items] |  |
Basis for Allocation | $ 44,808 |
Percentage Allocation | 81.00% |
Allocation of Insurance Proceeds | $ 29,093 |
Demolition Costs [Member] |  |
Insurance Recoveries [Line Items] |  |
Basis for Allocation | $ 7,276 |
Percentage Allocation | 13.00% |
Allocation of Insurance Proceeds | $ 4,724 |
Business Interruption [Member] |  |
Insurance Recoveries [Line Items] |  |
Basis for Allocation | $ 3,415 |
Percentage Allocation | 6.00% |
Allocation of Insurance Proceeds | $ 2,217 |

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