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Commitments and contingent liabilities - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 05, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Loss Contingencies [Line Items] |  |  |  |
Operating leases, rental expense |  | $ 34.0 | $ 34.6 | $ 29.4
Discontinued Operations |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Contingency reserve for litigation |  | $ 1.6 | 1.5 |
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Time-frame over which the accrued amounts may be paid out, in years |  | P15Y |  |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Time-frame over which the accrued amounts may be paid out, in years |  | P20Y |  |
Accrued Liabilities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Waste disposed accrued liability |  | $ 1.1 | 1.2 |
Contingency reserve for litigation |  | 2.5 | 2.5 |
Other Liability |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Waste disposed accrued liability |  | 5.8 | $ 6.1 |
Parish of Calcasieu | Judicial Ruling | Compensatory Damages |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages awarded to plaintiff | $ 0.1 |  |  |
Parish of Calcasieu | Judicial Ruling | Punitive Damages |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages awarded to plaintiff | $ 23.0 |  |  |
Parish of Calcasieu | Judicial Ruling | Unfavorable Regulatory Action | Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Range of possible loss |  | $ 10.0 |  |

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