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Summary of Significant Accounting Policies - Significant Estimates Used by Management in Determining Fair Values of Company's Reporting Units (Detail) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Electric Power and Oil and Gas Services Division [Member] |  |  |
Goodwill Impairment Testing Assumptions [Line Items] |  |  |
Years of cash flows before terminal value | 5 years | 5 years | 5 years
Weighting of three approaches: |  |  |
Discounted cash flows | 70.00% | 70.00% | 70.00%
Market multiple | 15.00% | 15.00% | 15.00%
Market capitalization | 15.00% | 15.00% | 15.00%
Electric Power and Oil and Gas Services Division [Member] | Minimum [Member] |  |  |
Goodwill Impairment Testing Assumptions [Line Items] |  |  |
Discount rates | 12.00% | 12.00% | 13.00%
EBITDA multiples | 5.0 | 4.5 | 4.5
Electric Power and Oil and Gas Services Division [Member] | Maximum [Member] |  |  |
Goodwill Impairment Testing Assumptions [Line Items] |  |  |
Discount rates | 14.00% | 13.00% | 13.00%
EBITDA multiples | 8.0 | 8.0 | 8.0
Fiber Optic Licensing Division[Member] |  |  |
Goodwill Impairment Testing Assumptions [Line Items] |  |  |
Years of cash flows before terminal value | 15 years | 15 years | 15 years
Discount rates | 12.00% | 12.00% | 14.00%
EBITDA multiples | 9.5 | 9.5 | 9.5
Weighting of three approaches: |  |  |
Discounted cash flows | 90.00% | 90.00% | 90.00%
Market multiple | 5.00% | 5.00% | 5.00%
Market capitalization | 5.00% | 5.00% | 5.00%

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