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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
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