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Segments and Operations by Geographic Area (Schedule of Significant Customers, Revenue Concentration) (Details) | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
At T [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment reporting, disclosure of major customers | The Company's relationship with AT&T is based upon master service agreements, other service agreements and construction/installation contracts for both AT&T's wireless and wireline infrastructure businesses. Revenue from AT&T is included in the Communications segment. |
Direct Tv [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment reporting, disclosure of major customers | The Company's relationship with DIRECTV® is based upon an agreement to provide installation and maintenance services for DIRECTV®. Revenue from DIRECTV® is included in the Communications segment. |
Enbridge [Member] [Domain] |  |
Segment Reporting Information [Line Items] |  |
Segment reporting, disclosure of major customers | The Company's relationship with Enbridge, Inc. is based upon a construction contract for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment. |
Segment, Continuing Operations [Member] | Reportable Segment [Member] | Communications [Member] | Customer Concentration Risk [Member] | At T [Member] |  |
Segment Reporting Information [Line Items] |  |
Entity-wide revenue, major customer, percentage | 18.00% | 19.00%
Segment, Continuing Operations [Member] | Reportable Segment [Member] | Communications [Member] | Customer Concentration Risk [Member] | Direct Tv [Member] |  |
Segment Reporting Information [Line Items] |  |
Entity-wide revenue, major customer, percentage | 16.00% | 20.00%
Segment, Continuing Operations [Member] | Reportable Segment [Member] | Oil and Gas [Member] | Customer Concentration Risk [Member] | Enbridge [Member] [Domain] |  |
Segment Reporting Information [Line Items] |  |
Entity-wide revenue, major customer, percentage | 12.00% | 0.00%

X
- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
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- Definition Disclosure of the extent of enterprise reliance on its major customers. For example, includes revenues from transactions with a single external customer amounting to 10 percent or more of the entity's revenues, the total amount of revenues from each such customer, and the identity of the segment or segments reporting the revenues. A group of entities that the entity knows to be under common control generally will be considered a single customer for inclusion in this item. The federal government, a state government, a local government (for example, a county or municipality), or a foreign government each will generally be considered as a single customer for inclusion in this item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 39 -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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- Details
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