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Goodwill and other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2012
Goodwill [Line Items] |
Changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill for the year ended December 31, 2012, were as follows:
| Balance as of January 1, 2012 |  | * | Goodwill Acquired During the Year |  | ** | Balance as of December 31, 2012 |  | *
| (In thousands) |
Natural gas distribution | $ | 345,736 |  |  | $ | — |  |  | $ | 345,736 |  |
Pipeline and energy services | 9,737 |  |  | — |  |  | 9,737 |  |
Construction materials and contracting | 176,290 |  |  | — |  |  | 176,290 |  |
Construction services | 103,168 |  |  | 1,108 |  |  | 104,276 |  |
Total | $ | 634,931 |  |  | $ | 1,108 |  |  | $ | 636,039 |  |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods. ** Includes contingent consideration that was not material related to an acquisition in a prior period. The changes in the carrying amount of goodwill for the year ended December 31, 2011, were as follows:
| Balance as of January 1, 2011 |  | * | Goodwill Acquired During the Year |  | ** | Balance as of December 31, 2011 |  | *
| (In thousands) |
Natural gas distribution | $ | 345,736 |  |  | $ | — |  |  | $ | 345,736 |  |
Pipeline and energy services | 9,737 |  |  | — |  |  | 9,737 |  |
Construction materials and contracting | 176,290 |  |  | — |  |  | 176,290 |  |
Construction services | 102,870 |  |  | 298 |  |  | 103,168 |  |
Total | $ | 634,633 |  |  | $ | 298 |  |  | $ | 634,931 |  |
* Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods. ** Includes contingent consideration that was not material related to an acquisition in a prior period.
Other amortizable intangible assets | Other amortizable intangible assets at December 31 were as follows:
| 2012 |  | 2011 |
| (In thousands)
Customer relationships | $ | 21,310 |  | $ | 21,702 |
Accumulated amortization | (11,701 | ) | (10,392 | )
| 9,609 |  | 11,310 |
Noncompete agreements | 7,236 |  | 7,685 |
Accumulated amortization | (5,326 | ) | (5,371 | )
| 1,910 |  | 2,314 |
Other | 10,979 |  | 11,442 |
Accumulated amortization | (5,369 | ) | (4,223 | )
| 5,610 |  | 7,219 |
Total | $ | 17,129 |  | $ | 20,843 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 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=14024403&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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