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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Revenue Recognition [Line Items] |  |  |  |  |
Performance obligations, description of timing |  |  | Performance obligations within paving service agreements are satisfied over time, primarily ranging from one day to two years. For product revenues and freight revenues, customer payment terms are generally 30 days from invoice date. Customer payments for the paving operations are based on a contractual billing schedule and are due 30 days from invoice date. |  |
Product and freight revenues customer payment terms |  |  | 30 days |  |
Customer payments terms based on contractual billing |  |  | 30 days |  |
Future revenues from unsatisfied performance obligations | $ 150.2 | $ 133.9 | $ 150.2 | $ 133.9 |
Service revenues | 1,321.4 | 1,420.2 | 3,550.3 | 3,638.7 |
Revenue recognized from contract liabilities | 8.5 | 8.0 | 7.2 | 6.5 |
Retainage on contracts | 10.7 |  | 10.7 |  | $ 10.2
Service |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Service revenues |  |  | $ 221.3 | $ 191.8 |
Service | COLORADO |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Service revenues | $ 112.8 | $ 110.9 |  |  |
Minimum | Service |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Performance obligations, period |  |  | 1 day |  |
Maximum | Service |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Performance obligations, period |  |  | 2 years |  |

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- Definition Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118388040&loc=d3e49370-109356 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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