Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount of damages awarded to the plaintiff in the legal matter.

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Commitments and contingent liabilities - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 05, 2014	Aug. 31, 2013
Loss Contingencies [Line Items]
Operating leases, rental expense	$ 29,400,000us-gaap_OperatingLeasesRentExpenseNet	$ 26,400,000us-gaap_OperatingLeasesRentExpenseNet	$ 24,000,000us-gaap_OperatingLeasesRentExpenseNet
Estimated fair value of the costs to construct buildings	51,834,000us-gaap_ConstructionInProgressGross	55,092,000us-gaap_ConstructionInProgressGross
Discontinued Operations
Loss Contingencies [Line Items]
Contingency reserve for litigation	2,400,000	1,400,000
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	1,300,000	2,500,000
Contingency reserve for litigation	6,000,000	6,800,000
Other Liability
Loss Contingencies [Line Items]
Waste disposed accrued liability	6,500,000	5,800,000
Property, Plant and Equipment \| Build To Suit Lease
Loss Contingencies [Line Items]
Estimated fair value of the costs to construct buildings					28,300,000
Parish of Calcasieu \| Judicial Ruling \| Compensatory Damages
Loss Contingencies [Line Items]
Damages awarded to plaintiff				125,000
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]
Loss Contingency, Range of Possible Loss, Maximum	$ 10,000,000