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Goodwill and other intangible assets (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | $ 634,633,000 | $ 629,463,000 | $ 629,463,000
Goodwill aquired during the year |  |  | 298,000 | 5,170,000 | 5,170,000
Balance as of end of period | 634,931,000 | 634,633,000 | 634,931,000 | 634,633,000 | 634,633,000
Accumulated impairment which occurred in prior periods | 12,300,000 | 12,300,000 | 12,300,000 | 12,300,000 | 12,300,000
Other amortizable intangible assets [Abstract] |  |  |  |  |
Other amortizable intangible assets, net | 22,248,000 | 26,112,000 | 22,248,000 | 26,112,000 | 25,271,000
Amortization expense for amortizable intangible assets | 1,100,000 | 1,300,000 | 3,000,000 | 3,400,000 |
Estimated amortization expense for amortizable intangible assets [Abstract] |  |  |  |  |
2011 |  |  | 4,000,000 |  |
2012 |  |  | 3,900,000 |  |
2013 |  |  | 3,700,000 |  |
2014 |  |  | 3,400,000 |  |
2015 |  |  | 2,700,000 |  |
Thereafter |  |  | 7,500,000 |  |
Electric [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 0 | 0 | 0
Goodwill aquired during the year |  |  | 0 | 0 | 0
Balance as of end of period | 0 | 0 | 0 | 0 | 0
Natural gas distribution [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 345,736,000 | 345,736,000 | 345,736,000
Goodwill aquired during the year |  |  | 0 | 0 | 0
Balance as of end of period | 345,736,000 | 345,736,000 | 345,736,000 | 345,736,000 | 345,736,000
Construction services [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 102,870,000 | 100,127,000 | 100,127,000
Goodwill aquired during the year |  |  | 298,000 | 2,743,000 | 2,743,000
Balance as of end of period | 103,168,000 | 102,870,000 | 103,168,000 | 102,870,000 | 102,870,000
Pipeline and energy services [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 9,737,000 | 7,857,000 | 7,857,000
Goodwill aquired during the year |  |  | 0 | 1,880,000 | 1,880,000
Balance as of end of period | 9,737,000 | 9,737,000 | 9,737,000 | 9,737,000 | 9,737,000
Natural gas and oil production [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 0 | 0 | 0
Goodwill aquired during the year |  |  | 0 | 0 | 0
Balance as of end of period | 0 | 0 | 0 | 0 | 0
Construction materials and contracting [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 176,290,000 | 175,743,000 | 175,743,000
Goodwill aquired during the year |  |  | 0 | 547,000 | 547,000
Balance as of end of period | 176,290,000 | 176,290,000 | 176,290,000 | 176,290,000 | 176,290,000
Other [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 0 | 0 | 0
Goodwill aquired during the year |  |  | 0 | 0 | 0
Balance as of end of period | 0 | 0 | 0 | 0 | 0
Customer Relationships [Member] |  |  |  |  |
Other amortizable intangible assets [Abstract] |  |  |  |  |
Other amortizable intangible assets | 21,702,000 | 24,942,000 | 21,702,000 | 24,942,000 | 24,942,000
Accumulated amortization | (9,896,000) | (11,273,000) | (9,896,000) | (11,273,000) | (11,625,000)
Other amortizable intangible assets, net | 11,806,000 | 13,669,000 | 11,806,000 | 13,669,000 | 13,317,000
Noncompete Agreements [Member] |  |  |  |  |
Other amortizable intangible assets [Abstract] |  |  |  |  |
Other amortizable intangible assets | 7,685,000 | 9,405,000 | 7,685,000 | 9,405,000 | 9,405,000
Accumulated amortization | (5,222,000) | (6,231,000) | (5,222,000) | (6,231,000) | (6,425,000)
Other amortizable intangible assets, net | 2,463,000 | 3,174,000 | 2,463,000 | 3,174,000 | 2,980,000
Other [Member} |  |  |  |  |
Other amortizable intangible assets [Abstract] |  |  |  |  |
Other amortizable intangible assets | 12,901,000 | 13,217,000 | 12,901,000 | 13,217,000 | 13,217,000
Accumulated amortization | (4,922,000) | (3,948,000) | (4,922,000) | (3,948,000) | (4,243,000)
Other amortizable intangible assets, net | $ 7,979,000 | $ 9,269,000 | $ 7,979,000 | $ 9,269,000 | $ 8,974,000

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -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 Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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- Definition The amount of amortization expense expected to be recognized for the remainder of the finite-lived intangible asset useful life after the fifth succeeding fiscal year. + Details
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- Definition Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 1 -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 43 -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 Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph l -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 4: 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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 34 -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 6: 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=6905597&loc=d3e13816-109267 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph d -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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- Definition The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph d -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 Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 2 -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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- Definition The accumulated impairment losses related to goodwill as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 42, 45 -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 Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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