Insurance Recoveries (Allocation Of The Total Insurance Proceeds To The Various Risks and Bases) (Details) NZD in Thousands	9 Months Ended
	Sep. 30, 2017 NZD
Insurance Recoveries [Line Items]
Basis for Allocation	NZD 55,499
Percentage Allocation	100.00%
Allocation of Insurance Proceeds	NZD 36,034
Property Damage [Member]
Insurance Recoveries [Line Items]
Basis for Allocation	NZD 44,808
Percentage Allocation	81.00%
Allocation of Insurance Proceeds	NZD 29,093
Demolition Costs [Member]
Insurance Recoveries [Line Items]
Basis for Allocation	NZD 7,276
Percentage Allocation	13.00%
Allocation of Insurance Proceeds	NZD 4,724
Business Interruption [Member]
Insurance Recoveries [Line Items]
Basis for Allocation	NZD 3,415
Percentage Allocation	6.00%
Allocation of Insurance Proceeds	NZD 2,217