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Commitments and contingent liabilities - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 05, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Loss Contingencies [Line Items] |  |  |  |
Operating leases, rental expense |  | $ 34,600,000 | $ 29,400,000 | $ 26,400,000
Discontinued Operations |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Contingency reserve for litigation |  | $ 1,500,000 | 2,400,000 |
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 |  | $ 1,200,000 | 1,300,000 |
Contingency reserve for litigation |  | 2,500,000 | 6,000,000 |
Other Liability |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Waste disposed accrued liability |  | 6,100,000 | $ 6,500,000 |
Parish of Calcasieu | Judicial Ruling | Compensatory Damages |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages awarded to plaintiff | $ 100,000 |  |  |
Parish of Calcasieu | Judicial Ruling | Punitive Damages |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages awarded to plaintiff | $ 23,000,000 |  |  |
Parish of Calcasieu | Judicial Ruling | Unfavorable Regulatory Action |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Range of possible loss, maximum |  | $ 10,000,000 |  |

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