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Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2017 | Jul. 02, 2016 | Jul. 01, 2017 | Jul. 02, 2016
Summary of segment information [Abstract] |  |  |  |
Net sales | $ 614,266 | $ 544,071 | $ 1,192,186 | $ 1,076,880
Cost of goods sold | 524,311 | 456,060 | 1,012,738 | 902,702
Depreciation and amortization | 8,595 | 9,061 | 16,950 | 17,981
Selling, general, and administrative expense | 34,557 | 34,514 | 70,088 | 70,294
Operating income | 46,803 | 44,436 | 92,410 | 85,903
Interest expense | (6,442) | (1,692) | (8,973) | (3,540)
Other income, net | 231 | 515 | 782 | 760
Income before income taxes | 40,592 | 43,259 | 84,219 | 83,123
Operating Segments [Member] | Piping Systems [Member] |  |  |  |
Summary of segment information [Abstract] |  |  |  |
Net sales | 422,844 | 388,662 | 821,619 | 757,552
Cost of goods sold | 364,261 | 333,356 | 708,907 | 647,148
Depreciation and amortization | 5,591 | 5,787 | 10,933 | 11,436
Selling, general, and administrative expense | 18,410 | 16,560 | 36,831 | 34,850
Operating income | 34,582 | 32,959 | 64,948 | 64,118
Operating Segments [Member] | Industrial Metals [Member] |  |  |  |
Summary of segment information [Abstract] |  |  |  |
Net sales | 154,504 | 127,737 | 304,341 | 262,258
Cost of goods sold | 132,972 | 104,874 | 257,015 | 214,103
Depreciation and amortization | 1,904 | 2,120 | 3,802 | 4,255
Selling, general, and administrative expense | 2,864 | 3,619 | 6,094 | 6,864
Operating income | 16,764 | 17,124 | 37,430 | 37,036
Operating Segments [Member] | Climate [Member] |  |  |  |
Summary of segment information [Abstract] |  |  |  |
Net sales | 36,636 | 31,359 | 70,915 | 62,065
Cost of goods sold | 27,449 | 22,448 | 53,013 | 46,153
Depreciation and amortization | 615 | 618 | 1,244 | 1,217
Selling, general, and administrative expense | 2,456 | 2,456 | 4,932 | 4,979
Operating income | 6,116 | 5,837 | 11,726 | 9,716
Corporate and Eliminations [Member] |  |  |  |
Summary of segment information [Abstract] |  |  |  |
Net sales | 282 | (3,687) | (4,689) | (4,995)
Cost of goods sold | (371) | (4,618) | (6,197) | (4,702)
Depreciation and amortization | 485 | 536 | 971 | 1,073
Selling, general, and administrative expense | 10,827 | 11,879 | 22,231 | 23,601
Operating income | $ (10,659) | $ (11,484) | $ (21,694) | $ (24,967)

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- Definition Total costs related to goods produced and sold during the reporting period. + 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 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: 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 Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + 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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