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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 ($) | Feb. 17, 2017 USD ($)
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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 |  |

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