Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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- Definition

Number of price risk derivative instruments held by the entity at the reporting date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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Hedging Transactions and Derivative Financial Instruments (Additional Information) (Detail) $ in Millions	Dec. 31, 2018 T / mo Contract	Mar. 31, 2017 USD ($)	Feb. 17, 2017 USD ($)
Bank Term Loan
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative contracts related to minimizing risk associated with potential rise in copper prices \| Contract	26
Revolving Credit Facility \| Third Amended Credit Agreement
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit agreement, maximum borrowing capacity \| $			$ 450.0
Revolving Credit Facility \| Third Amended Credit Agreement \| Interest rate swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, amount of hedged item \| $		$ 75.0
Designated as Hedging Instrument \| January 2019 - March 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume of copper derivatives	189
Designated as Hedging Instrument \| April 2019 - June 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume of copper derivatives	188
Designated as Hedging Instrument \| July 2019 - September 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume of copper derivatives	191
Designated as Hedging Instrument \| October 2019 - December 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume of copper derivatives	195
Designated as Hedging Instrument \| January 2020 - March 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume of copper derivatives	202