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Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Apr. 01, 2017
Summary of segment information [Abstract] |  |  |
Net sales | $ 640,060 | $ 577,920 | [1]
Cost of goods sold | 545,670 | 488,427 | [1]
Depreciation and amortization | 9,456 | 8,355 | [1]
Selling, general, and administrative expense | 34,057 | 35,574 | [1]
Asset impairment | 3,469 | 0 | [2]
Operating income | 47,408 | 45,564 | [1]
Interest expense | (5,909) | (2,531) | [1]
Other income, net | 560 | 594 | [1]
Income before income taxes | 42,059 | 43,627 | [1]
Operating Segments [Member] | Piping Systems [Member] |  |  |
Summary of segment information [Abstract] |  |  |
Net sales | 430,964 | 398,775 |
Cost of goods sold | 372,895 | 344,646 |
Depreciation and amortization | 5,878 | 5,342 |
Selling, general, and administrative expense | 19,242 | 18,197 |
Asset impairment | 0 |  |
Operating income | 32,949 | 30,590 |
Operating Segments [Member] | Industrial Metals [Member] |  |  |
Summary of segment information [Abstract] |  |  |
Net sales | 177,332 | 149,837 |
Cost of goods sold | 149,423 | 124,043 |
Depreciation and amortization | 1,903 | 1,898 |
Selling, general, and administrative expense | 3,373 | 3,549 |
Asset impairment | 0 |  |
Operating income | 22,633 | 20,347 |
Operating Segments [Member] | Climate [Member] |  |  |
Summary of segment information [Abstract] |  |  |
Net sales | 36,063 | 34,279 |
Cost of goods sold | 27,286 | 25,564 |
Depreciation and amortization | 621 | 629 |
Selling, general, and administrative expense | 2,609 | 2,476 |
Asset impairment | 0 |  |
Operating income | 5,547 | 5,610 |
Corporate and Eliminations [Member] |  |  |
Summary of segment information [Abstract] |  |  |
Net sales | (4,299) | (4,971) |
Cost of goods sold | (3,934) | (5,826) |
Depreciation and amortization | 1,054 | 486 |
Selling, general, and administrative expense | 8,833 | 11,352 |
Asset impairment | 3,469 |  |
Operating income | $ (13,721) | $ (10,983) |
[1] | The Condensed Consolidated Statement of Income for the quarter ended April 1, 2017 has been adjusted to reflect the adoption of ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The components of net periodic benefit cost (income) other than the service cost component are included in other income, net in the Condensed Consolidated Statements of Income. Refer to Note 1 for further discussion.
[2] | The Condensed Consolidated Statement of Cash Flows for the quarter ended April 1, 2017 has been adjusted to reflect the adoption of ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The Condensed Consolidated Statements of Cash Flows reflects the changes during the periods in the total of cash, cash equivalents, and restricted cash. Therefore, restricted cash activity is included with cash when reconciling the beginning-of-period and end-of-period total amounts shown. Refer to Note 1 for further discussion.

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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