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Commitments And Contingencies - Additional Information (Detail) BRL in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 22, 2011 USD ($) | Nov. 22, 2011 BRL | Dec. 31, 2015 USD ($) | Dec. 31, 2015 BRL | May. 31, 2012 USD ($) | Jun. 30, 2010 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages asserted by BK | BRL |  |  |  | BRL 20.8 |  |
Accrual for Environmental Loss Contingencies |  |  |  |  |  | $ 100.0
Business combination, recognized identifiable assets acquired and liabilities assumed, contingent liability |  |  |  |  | $ 2.9 |
Purchase Obligation |  |  | $ 72.4 |  |  |
Court-Imposed Interest, Fees or Inflation Adjustments |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total ordered damages granted to Bk | $ 6.9 |  |  |  |  |
Court-Imposed Interest, Fees or Inflation Adjustments | Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages asserted by BK | $ 48.0 |  |  |  |  |
Total ordered damages granted to Bk | BRL |  | BRL 26.7 |  |  |  |
Arizona Department Of Environmental Quality |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages asserted by BK |  |  | 0.2 |  |  |
Loss Contingency, Estimate of Possible Loss |  |  | 0.5 |  |  |
Standby Letters Of Credit |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  | $ 6.0 |  |  |

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