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Acquisitions And Other Investments (Narrative) (Detail) (USD $) | 3 Months Ended |  | 3 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |  | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Panama Subsidiary [Member] Segment, Discontinued Operations [Member] | Mar. 31, 2013 Rock Extraction Business [Member] Panama Subsidiary [Member] Segment, Discontinued Operations [Member] | Mar. 31, 2012 Rock Extraction Business [Member] Panama Subsidiary [Member] Segment, Discontinued Operations [Member] | Dec. 31, 2012 Rock Extraction Business [Member] Panama Subsidiary [Member] Segment, Discontinued Operations [Member] | Mar. 31, 2013 Rock Extraction Business [Member] Beneficial Owner [Member] Segment, Discontinued Operations [Member] | Dec. 31, 2012 Go Green [Member] | Dec. 02, 2012 Go Green [Member] | Dec. 31, 2012 Dynamic Tower [Member] | Dec. 02, 2012 Dynamic Tower [Member] | Mar. 31, 2013 2012 Acquisitions [Member] | Mar. 31, 2013 EC Source [Member] Earn-out Arrangements [Member] | Mar. 31, 2013 Optima [Member] Earn-out Arrangements [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective date of acquisition |  |  |  |  |  |  |  | Dec. 01, 2012 |  | Dec. 01, 2012 |  |  |  |
Business combination, percentage of voting interests acquired |  |  |  |  |  |  |  |  | 100.00% |  | 100.00% |  |  |
Acquiree revenue since acquisition date |  |  |  |  |  |  |  |  |  |  |  | $ 43,100,000 |  |
Acquiree net income since acquisition date |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |
Change in range of outcomes, contingent consideration, reasons |  |  |  |  |  |  |  |  |  |  |  |  | the Company remeasured the contingent consideration liability for EC Source Services LLC ("EC Source") using currently available facts and circumstances, including recent and expected future performance | the contingent consideration liability for Optima Network Services, Inc. ("Optima") was remeasured and settled in full during the first quarter of 2013 as a result of an amendment to the Optima purchase agreement effective February 28, 2013
Less than wholly owned subsidiary, ownership percentage |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 34.00% |  |  | 20.40% |  |  |  |  |  |  |
Related party revenues |  |  |  | 0 | 800,000 |  |  |  |  |  |  |  |  |
Related party receivables, equity method investee |  |  |  | 3,700,000 |  | 3,700,000 |  |  |  |  |  |  |  |
Asset impairment charges, cost method investments | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges, equity method investments | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |

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