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Business Combinations - Summary, Pro Forma, Allocation (Details) $ in Thousands |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 08, 2017 USD ($) | Apr. 20, 2017 USD ($) | Mar. 29, 2017 USD ($) | Feb. 27, 2017 USD ($) | Jan. 16, 2017 USD ($) | Aug. 16, 2016 USD ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) item
Business Combinations |  |  |  |  |  |  |  |
Number of acquisitions | item |  |  |  |  |  |  | 6 | 1
Cash consideration |  |  |  |  |  |  | $ 84,090 | $ 3,476
Pro Forma Results |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  | 1,928,082 | 1,829,026
Net income |  |  |  |  |  |  | 159,440 | 76,894
Amortization of intangible assets |  |  |  |  |  |  | 1,131 | 3,663
Income tax expense (using normalized 38% ETR) |  |  |  |  |  |  | $ 801 | $ 2,628
ETR (as a percent) |  |  |  |  |  |  | 38.00% | 38.00%
Purchase Price Allocations |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 1,077,186 | $ 1,045,058
Selling, General and Administrative Expenses |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  | 1,300 | $ 100
2017 Acquisitions |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | 88,750 |
Cash consideration |  |  |  |  |  |  | 84,090 |
Contingent consideration |  |  |  |  |  |  | 2,110 |
Deferred purchase price |  |  |  |  |  |  | 2,550 |
Purchase Price Allocations |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  | 21,307 |
Inventories |  |  |  |  |  |  | 2,231 |
Prepaid and other assets |  |  |  |  |  |  | 40 |
Property and equipment |  |  |  |  |  |  | 3,377 |
Intangible assets |  |  |  |  |  |  | 33,580 |
Goodwill |  |  |  |  |  |  | 32,128 |
Accounts payable |  |  |  |  |  |  | (3,607) |
Accrued liabilities |  |  |  |  |  |  | (306) |
Net assets acquired |  |  |  |  |  |  | 88,750 |
Valley |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  | $ 3,500 |  |
Midwest |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | 12,225 |
Cash consideration |  |  |  |  | $ 12,200 |  | 12,225 |
Revenue and Net Income Since Acquisition Date |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  | 17,122 |
Net Income |  |  |  |  |  |  | 304 |
Purchase Price Allocations |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  | 6,576 |
Inventories |  |  |  |  |  |  | 75 |
Property and equipment |  |  |  |  |  |  | 655 |
Intangible assets |  |  |  |  |  |  | 2,740 |
Goodwill |  |  |  |  |  |  | 3,538 |
Accounts payable |  |  |  |  |  |  | (1,359) |
Net assets acquired |  |  |  |  |  |  | 12,225 |
EcoFoam |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 22,300 |  |  | 22,325 |
Cash consideration |  |  |  | 20,200 |  |  | 20,215 |
Contingent consideration |  |  |  | 2,100 |  |  | 2,110 |
Revenue and Net Income Since Acquisition Date |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  | 22,315 |
Net Income |  |  |  |  |  |  | 1,747 |
Purchase Price Allocations |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  | 3,819 |
Inventories |  |  |  |  |  |  | 1,119 |
Prepaid and other assets |  |  |  |  |  |  | 27 |
Property and equipment |  |  |  |  |  |  | 1,544 |
Intangible assets |  |  |  |  |  |  | 6,700 |
Goodwill |  |  |  |  |  |  | 10,796 |
Accounts payable |  |  |  |  |  |  | (1,378) |
Accrued liabilities |  |  |  |  |  |  | (302) |
Net assets acquired |  |  |  |  |  |  | 22,325 |
MR Insulfoam |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 1,500 |  |  |  |
Capital |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 7,300 |  |  |  |  |
Superior |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |
Purchase price |  | $ 10,900 |  |  |  |  | 10,952 |
Cash consideration |  |  |  |  |  |  | 10,952 |
Revenue and Net Income Since Acquisition Date |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  | 9,508 |
Net Income |  |  |  |  |  |  | 922 |
Purchase Price Allocations |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  | 2,012 |
Inventories |  |  |  |  |  |  | 321 |
Prepaid and other assets |  |  |  |  |  |  | 1 |
Property and equipment |  |  |  |  |  |  | 361 |
Intangible assets |  |  |  |  |  |  | 5,280 |
Goodwill |  |  |  |  |  |  | 3,662 |
Accounts payable |  |  |  |  |  |  | (681) |
Accrued liabilities |  |  |  |  |  |  | (4) |
Net assets acquired |  |  |  |  |  |  | 10,952 |
Canyon |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |
Purchase price | $ 34,400 |  |  |  |  |  | 34,415 |
Cash consideration | 30,000 |  |  |  |  |  | 31,865 |
Deferred purchase price | $ 4,400 |  |  |  |  |  | 2,550 |
Payments related to the deferred purchase price |  |  |  |  |  |  | 4,400 |
Revenue and Net Income Since Acquisition Date |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  | 13,333 |
Net Income |  |  |  |  |  |  | 1,279 |
Purchase Price Allocations |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  | 8,222 |
Inventories |  |  |  |  |  |  | 575 |
Prepaid and other assets |  |  |  |  |  |  | 6 |
Property and equipment |  |  |  |  |  |  | 460 |
Intangible assets |  |  |  |  |  |  | 15,220 |
Goodwill |  |  |  |  |  |  | 10,095 |
Accounts payable |  |  |  |  |  |  | (163) |
Net assets acquired |  |  |  |  |  |  | 34,415 |
All others |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | 8,833 |
Cash consideration |  |  |  |  |  |  | 8,833 |
Revenue and Net Income Since Acquisition Date |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  | 8,412 |
Net Income |  |  |  |  |  |  | 892 |
Purchase Price Allocations |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  | 678 |
Inventories |  |  |  |  |  |  | 141 |
Prepaid and other assets |  |  |  |  |  |  | 6 |
Property and equipment |  |  |  |  |  |  | 357 |
Intangible assets |  |  |  |  |  |  | 3,640 |
Goodwill |  |  |  |  |  |  | 4,037 |
Accounts payable |  |  |  |  |  |  | (26) |
Net assets acquired |  |  |  |  |  |  | $ 8,833 |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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