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Concentrations of Risk (Tables) | 3 Months Ended
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Mar. 31, 2013
Concentration Risk [Line Items] |
Schedule of Major Customer Revenue Concentration | Revenue concentration information for significant customers, as a percent of total consolidated revenue from continuing operations, is as follows:
| For the Three Months Ended March 31,
| 2013 |  | 2012
Customer: |  |  |
AT&T | 18% |  | 19%
DIRECTV® | 16% |  | 20%
Enbridge, Inc. | 12% |  | —%
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. 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. 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.
Ten Largest Customers [Member] |
Concentration Risk [Line Items] |
Schedule of Major Customer Revenue Concentration | Revenue concentration information for the Company's top ten customers, as a percent of total consolidated revenue from continuing operations, is as follows:
| For the Three Months Ended March 31,
| 2013 |  | 2012
Revenue from top ten customers | 69% |  | 71%

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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 39 + Details
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