Commitments, Contingencies and Legal Proceedings - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Operable_Unit	Dec. 31, 2015 USD ($)
Commitments Contingencies And Litigation [Line Items]
Annual payments due under operating leases	$ 23,700
Aggregate contractual obligation	$ 124,600
Number of operable units | Operable_Unit	5
Increase in remediation activities reserve	$ 40,000	$ 10,000
Reserve for Environmental liabilities, current portion	25,000	12,544
Other Long-Term Liabilities [Member]
Commitments Contingencies And Litigation [Line Items]
Reserve for Environmental liabilities, remaining portion	27,800
January 17, 2017 Consent Decree [Member]
Commitments Contingencies And Litigation [Line Items]
Contribution payment towards remedial action and natural resource damages	65,000
Anticipated cost to complete work for remaining site remedy	200,000
Expected payments for governments unreimbursed past costs which are under dispute	34,000
GP [Member] | January 17, 2017 Consent Decree [Member]
Commitments Contingencies And Litigation [Line Items]
Contribution payment towards remedial action and natural resource damages	$ 145,000
Minimum [Member] | December 2009 – Long Term Monitoring Plan [Member]
Commitments Contingencies And Litigation [Line Items]
Period over which cash expenditure to be incurred for monitoring activities	30 years
Minimum [Member] | GLT, GP and NCR [Member] | January 17, 2017 Consent Decree [Member]
Commitments Contingencies And Litigation [Line Items]
Contribution payment towards remedial action and natural resource damages	$ 1,000,000
Maximum [Member]
Commitments Contingencies And Litigation [Line Items]
Estimated cost related to Fox River matter	150,000
Maximum [Member] | January 17, 2017 Consent Decree [Member]
Commitments Contingencies And Litigation [Line Items]
Estimated cost related to Fox River matter	40,000
OU2-5 [Member]
Commitments Contingencies And Litigation [Line Items]
Estimated future cost of cleanup work	$ 13,400	$ 13,400
Expected cleanup work continuation year	through 2018
NCR costs and damages percentage	100.00%
OU2-5 [Member] | Whiting Litigation [Member]
Commitments Contingencies And Litigation [Line Items]
NCR costs and damages percentage	100.00%