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Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 16, 2017 | Jun. 30, 2016 | Feb. 28, 2015
Business combinations |  |  |  |  |  |  |
Cash paid for acquisitions |  | $ 66,205 | $ 10,997 | $ 22,302 |  |  |
Fair value of the assets acquired and the liabilities assumed |  |  |  |  |  |  |
Intangible assets |  | 21,125 | 3,000 | 3,850 |  |  |
Goodwill |  | 153,374 | 127,226 | 124,161 |  |  |
Purchase price allocation adjustments |  | (121) |  |  |  |  |
2017 Acquisition |  |  |  |  |  |  |
Fair value of the assets acquired and the liabilities assumed |  |  |  |  |  |  |
Accounts receivable |  | 10,721 |  |  |  |  |
Costs and estimated earnings in excess of billings |  | 580 |  |  |  |  |
Inventory and other assets |  | 2,352 |  |  |  |  |
Property, plant and equipment |  | 12,402 |  |  |  |  |
Intangible assets |  | 21,125 |  |  |  |  |
Goodwill |  | 26,269 |  |  |  |  |
Accounts payable |  | (3,380) |  |  |  |  |
Billings in excess of costs and estimated earnings |  | (447) |  |  |  |  |
Accrued expenses |  | (2,096) |  |  |  |  |
Total |  | 67,526 |  |  |  |  |
2016 Acquisition |  |  |  |  |  |  |
Fair value of the assets acquired and the liabilities assumed |  |  |  |  |  |  |
Accounts receivable |  |  | 1,606 |  |  |  |
Inventory and other assets |  |  | 64 |  |  |  |
Property, plant and equipment |  |  | 2,133 |  |  |  |
Intangible assets |  |  | 3,000 |  |  |  |
Goodwill |  |  | 5,781 |  |  |  |
Accounts payable |  |  | (726) |  |  |  |
Accrued expenses |  |  | (861) |  |  |  |
Total |  |  | 10,997 |  |  |  |
2015 Acquisitions |  |  |  |  |  |  |
Fair value of the assets acquired and the liabilities assumed |  |  |  |  |  |  |
Accounts receivable |  |  |  | 2,734 |  |  |
Inventory and other assets |  |  |  | 1,476 |  |  |
Property, plant and equipment |  |  |  | 11,173 |  |  |
Intangible assets |  |  |  | 3,850 |  |  |
Goodwill |  |  |  | 5,152 |  |  |
Accounts payable |  |  |  | (743) |  |  |
Accrued expenses |  |  |  | (1,340) |  |  |
Total |  |  |  | 22,302 |  |  |
Aevenia |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |
Cash paid for acquisitions |  |  |  | $ 22,302 |  |  |
Coastal |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |
Cash paid for acquisitions |  | 27,519 |  |  |  |  |
Fair value of the assets acquired and the liabilities assumed |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  | $ 4,000 |  |
Goodwill |  |  |  |  | $ 9,300 |  |
Engineering |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |
Cash paid for acquisitions |  | 2,315 |  |  |  |  |
FGC |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |
Cash paid for acquisitions |  | 36,492 |  |  |  |  |
Fair value of the assets acquired and the liabilities assumed |  |  |  |  |  |  |
Property, plant and equipment |  | 4,800 |  |  |  |  |
Goodwill |  | 17,000 |  |  |  |  |
Northern |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |
Cash paid for acquisitions |  | $ (121) | 6,889 |  |  |  |
Fair value of the assets acquired and the liabilities assumed |  |  |  |  |  |  |
Goodwill | $ 3,700 |  |  |  |  |  |
Cash | 100 |  |  |  |  |  |
Purchase price allocation adjustments | $ (100) |  |  |  |  |  |
Mueller |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |
Cash paid for acquisitions |  |  | $ 4,108 |  |  |  |
Fair value of the assets acquired and the liabilities assumed |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  | $ 2,000 |
Goodwill |  |  |  |  |  | $ 2,000 |
Aevenia |  |  |  |  |  |  |
Fair value of the assets acquired and the liabilities assumed |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  | $ 11,200
Goodwill |  |  |  |  |  |  | $ 5,200

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