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Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | $ 645,958 | $ 550,363 | [1] | $ 1,948,791 | $ 1,742,549 | [1]
Cost of goods sold | 566,956 | 471,262 | [1] | 1,676,446 | 1,484,000 | [1]
Depreciation and amortization | 10,619 | 8,266 | [1] | 29,081 | 25,216 | [1]
Selling, general, and administrative expense | 38,889 | 33,214 | [1] | 112,077 | 104,676 | [1]
Asset impairments | 0 | 0 | [1] | 0 | 411 | [1],[2]
(Gain) loss on sale of assets | (2,691) | 140 | [1] | (334) | (1,491) | [1]
Insurance recovery | (1,486) | 0 | [1] | (1,486) | 0 | [1],[2]
Operating income | 33,671 | 37,481 | [1] | 133,007 | 129,737 | [1]
Interest expense | (6,746) | (5,237) | [1] | (18,728) | (14,210) | [1]
Other income (expense), net | 411 | (380) | [1] | 1,557 | 556 | [1]
Income before income taxes | 27,336 | 31,864 | [1] | 115,836 | 116,083 | [1]
Operating Segments [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | 650,853 | 564,144 |  | 1,963,458 | 1,761,019 |
Operating Segments [Member] | Piping Systems [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | 410,525 | 384,078 |  | 1,294,672 | 1,205,697 |
Cost of goods sold | 363,174 | 340,191 |  | 1,120,890 | 1,049,098 |
Depreciation and amortization | 5,946 | 5,290 |  | 17,568 | 16,223 |
Selling, general, and administrative expense | 17,387 | 17,516 |  | 57,931 | 55,133 |
Asset impairments |  |  |  |  | 411 |
(Gain) loss on sale of assets | (1,390) | 140 |  | (2,093) | (1,491) |
Insurance recovery | 0 |  |  | 0 |  |
Operating income | 25,408 | 20,941 |  | 100,376 | 86,323 |
Operating Segments [Member] | Industrial Metals [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | 158,709 | 147,578 |  | 511,932 | 451,919 |
Cost of goods sold | 141,435 | 120,021 |  | 445,259 | 377,036 |
Depreciation and amortization | 1,864 | 1,845 |  | 5,715 | 5,647 |
Selling, general, and administrative expense | 3,086 | 3,014 |  | 9,908 | 9,802 |
Asset impairments |  |  |  |  | 0 |
(Gain) loss on sale of assets | (1,301) | 0 |  | (1,301) | 0 |
Insurance recovery | (1,486) |  |  | (1,486) |  |
Operating income | 15,111 | 22,698 |  | 53,837 | 59,434 |
Operating Segments [Member] | Climate [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | 81,619 | 32,488 |  | 156,854 | 103,403 |
Cost of goods sold | 66,832 | 24,111 |  | 124,806 | 77,124 |
Depreciation and amortization | 2,123 | 636 |  | 3,371 | 1,880 |
Selling, general, and administrative expense | 6,890 | 2,312 |  | 12,009 | 7,244 |
Asset impairments |  |  |  |  | 0 |
(Gain) loss on sale of assets | 0 | 0 |  | 0 | 0 |
Insurance recovery | 0 |  |  | 0 |  |
Operating income | 5,774 | 5,429 |  | 16,668 | 17,155 |
Corporate and Eliminations [Member] |  |  |  |  |  |
Summary of segment information [Abstract] |  |  |  |  |  |
Net sales | (4,895) | (13,781) |  | (14,667) | (18,470) |
Cost of goods sold | (4,485) | (13,061) |  | (14,509) | (19,258) |
Depreciation and amortization | 686 | 495 |  | 2,427 | 1,466 |
Selling, general, and administrative expense | 11,526 | 10,372 |  | 32,229 | 32,497 |
Asset impairments |  |  |  |  | 0 |
(Gain) loss on sale of assets | 0 | 0 |  | 3,060 | 0 |
Insurance recovery | 0 |  |  | 0 |  |
Operating income | $ (12,622) | $ (11,587) |  | $ (37,874) | $ (33,175) |
[1] | The Condensed Consolidated Statements of Income for the quarter and nine months ended September 30, 2017 have 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 (expense), 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 nine months ended September 30, 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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