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Contingencies (Detail)
$ in Thousands
Jun. 30, 2016
USD ($)
Loss Contingencies [Line Items]  
Reserve for environmental matters $ 15,152
Environmental Issue  
Loss Contingencies [Line Items]  
Largest range for any one site 7,600
Minimum | Environmental Issue  
Loss Contingencies [Line Items]  
Estimated total liability for environmental sites 15,200
Maximum | Environmental Issue  
Loss Contingencies [Line Items]  
Estimated total liability for environmental sites $ 80,600