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Goodwill and Other Intangible Assets (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended
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Jun. 30, 2013 Acquisitions During 2013 [Member] | Jun. 30, 2013 Bottom Line Services [Member] | Jun. 30, 2013 Bottom Line Services [Member] | Mar. 31, 2013 Dynamic Tower [Member] | Jun. 30, 2013 Dynamic Tower [Member] | Sep. 30, 2012 Globetec [Member]
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, explanation of significant additions | During the second quarter of 2013, the Company acquired Big Country, an oil and gas pipeline and facility construction services company, and Data Cell, a telecommunications infrastructure company. |  |  |  |  |
Purchase price consideration, adjustment |  | $ 2.4 |  | $ 4.7 |  |
Business combination, provisional information, initial accounting incomplete, nature of adjustments |  |  | $2.3 million of additional pre-acquisition project cost liabilities were recorded as a result of the ongoing review of the acquired net working capital of BLS. In addition, accounts receivable were reduced by $0.1 million. These adjustments resulted in an increase to the previously recorded amount of BLS goodwill of $2.4 million. |  | recorded $4.7 million of post-closing purchase price adjustments relating to the 2012 acquisition of DTS during the first quarter of 2013 based on DTS's final closing tangible net worth and net working capital |
Goodwill and intangible asset impairment, disposal group |  |  |  |  |  | $ 6.4

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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1500-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 55 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 72 -Subparagraph a(3) -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 This element represents a description of the nature of any measurement period adjustments (as defined) realized during the reporting period to the assets, liabilities, equity interests, or items of consideration for which the initial accounting was incomplete in connection with a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1500-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph a(3) -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 51 -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 Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
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- Definition An explanation of any significant addition to intangible assets during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.15) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 15 -Article 5 + Details
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