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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | The information in the following table is derived from the segment’s internal financial reports used for corporate management purposes:
|  | For the Year Ended December 31,
(in thousands) |  | 2015 |  | 2014 |  | 2013
Contract revenues: |  |  |  |  |  |  |  |  |  |  |  |
T&D |  | $ | 794,898 |  |  | $ | 699,595 |  |  | $ | 722,387 |
C&I |  |  | 266,783 |  |  |  | 244,372 |  |  |  | 180,342 |
|  | $ | 1,061,681 |  |  | $ | 943,967 |  |  | $ | 902,729 |
Income from operations: |  |  |  |  |  |  |  |  |  |  |  |
T&D |  | $ | 63,155 |  |  | $ | 75,439 |  |  | $ | 81,413 |
C&I |  |  | 13,592 |  |  |  | 16,542 |  |  |  | 10,423 |
General Corporate |  |  | (31,906 | ) |  |  | (33,577 | ) |  |  | (36,219 | )
|  | $ | 44,841 |  |  | $ | 58,404 |  |  | $ | 55,617 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] | Identifiable assets, consisting of contract receivables, costs and estimated earnings in excess of billings on uncompleted contracts, construction materials inventory, goodwill and intangibles for each segment are as follows as of December 31:
(in thousands) |  | 2015 |  | 2014
T&D |  | $ | 204,309 |  |  | $ | 190,105 |
C&I |  |  | 92,939 |  |  |  | 69,640 |
Other |  |  | 227,677 |  |  |  | 260,341 |
|  | $ | 524,925 |  |  | $ | 520,086 |
Schedule Of Segment Reporting Information Related To Allocation Of Depreciation And Amortization By Segment [Table Text Block] | An allocation of total depreciation, including depreciation of shared construction equipment, and amortization to each segment is as follows:
|  | For the Year Ended December 31,
(in thousands) |  | 2015 |  | 2014 |  | 2013
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |
T&D |  | $ | 35,456 |  |  | $ | 30,957 |  |  | $ | 27,545 |
C&I |  |  | 2,573 |  |  |  | 2,466 |  |  |  | 1,650 |
|  | $ | 38,029 |  |  | $ | 33,423 |  |  | $ | 29,195 |

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total assets from reportable segments to the entity's consolidated assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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