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Business Combination - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 27, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Combinations [Line Items] |  |  |  |  |
Business acquisition in cash |  |  |  | $ 1,645,698,000 | $ 2,200,000
Service revenues |  | $ 1,202,403,000 | $ 1,063,524,000 | 2,004,407,000 | 1,907,383,000
Acquisition-related expenses |  | 12,126,000 | $ 1,982,000 | 12,836,000 | 2,004,000
Bluegrass Materials Company |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Date of acquisition | Apr. 27, 2018 |  |  |  |
Business acquisition in cash | $ 1,623,000,000 |  |  |  |
Gain on sale of business |  |  |  |  | 14,785,000
Company acquired voting interest | 100.00% |  |  |  |
Service revenues |  | 46,351,000 |  | 6,745,000 |
Acquisition-related expenses |  | $ 26,911,000 |  | $ 27,621,000 | 26,100,000
Increase in cost of sales |  |  |  |  | $ 19,893,000
Bluegrass Materials Company | Forsyth Quarry |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Gain on sale of business | $ 14,785,000 |  |  |  |
Bluegrass Materials Company | Beaver Creek |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Gain on sale of business | $ 0 |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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