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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Sunrise Powerlink Project [Member] | Dec. 31, 2013 Sunrise Powerlink Project [Member] | Dec. 06, 2013 Howard Midstream Energy Partners, LLC. [Member] | Dec. 31, 2012 Howard Midstream Energy Partners, LLC. [Member] | Dec. 31, 2013 Fiber Optic Licensing Division[Member] | Dec. 31, 2012 Fiber Optic Licensing Division[Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Minimum [Member] Fiber Optic Licensing Division[Member] | Dec. 31, 2013 Minimum [Member] Electric Power and Oil and Gas Services Division [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Maximum [Member] Fiber Optic Licensing Division[Member] | Dec. 31, 2013 Maximum [Member] Electric Power and Oil and Gas Services Division [Member]
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment ownership |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  | 50.00% |  |
Cash and cash equivalents | $ 488,777,000 | $ 394,701,000 | $ 315,349,000 | $ 539,221,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents | 247,800,000 | 92,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents held in domestic bank accounts | 236,700,000 | 254,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents held in foreign bank accounts | 252,100,000 | 140,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of days after accounts receivable are treated as delinquent | 30 days | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of days related to outstanding accounts receivable for analysis of the allowance for doubtful accounts | At least 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total allowances for doubtful accounts | 5,215,000 | 5,447,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current retainage balances | 194,500,000 | 180,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-current retainage balances | 50,800,000 | 22,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables | 179,200,000 | 127,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense related to property and equipment | 134,110,000 | 120,303,000 | 109,874,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Construction work-in-progress | 44,030,000 | 33,546,000 |  |  |  |  |  |  | 32,400,000 | 19,000,000 |  |  |  |  |  |
Accrued capital expenditures | 600,000 | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term receivable |  |  |  |  |  | 165,000,000 |  |  |  |  |  |  |  |  |  |
Debt issuance costs related to amendment | 3,244,000 |  | 4,127,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost write off | 200,000 |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized debt issuance costs | 7,600,000 | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization of debt issuance costs | 2,400,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to capitalized debt issuance costs | 1,081,000 | 904,000 | 901,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in fair value of reporting units considered, for impairment calculation | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual growth rates by reporting units |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  | 12.00% | 38.00%
Proceeds from sale of equity ownership interest |  |  |  |  |  |  | 220,900,000 |  |  |  |  |  |  |  |  |
Gain on sale of equity ownership interest, Pre tax |  |  |  |  |  |  | 112,700,000 |  |  |  |  |  |  |  |  |
Equity ownership percentage held |  |  |  |  |  |  |  | 31.00% |  |  |  |  |  |  |  |
Balance of equity ownership interest |  |  |  |  |  |  |  | 90,500,000 |  |  |  |  |  |  |  |
Percent change in contract estimates impact on operating results is less than this percentage | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change orders and/or claims | 241,800,000 | 205,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue associated with change order |  |  |  |  | 165,000,000 |  |  |  |  |  |  |  |  |  |  |
Fiber Optic Licensing Terms, Minimum in years | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fiber Optic Licensing Terms, Maximum in years | 25 years | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fiber optic deferred revenue | 48,800,000 | 46,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fiber optic non-current deferred revenue | 40,200,000 | 37,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount of unrecognized tax benefits relating to uncertain tax positions | 48,838,000 | 51,244,000 | 47,379,000 | 50,632,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount of unrecognized tax benefits change from year-end relating to uncertain tax positions | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount expected to decrease due to settlements of audits or as a result of the expiration of certain statutes of limitations within the next 12 months | 6,722,000 | 11,479,000 | 12,110,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits decreases resulting from prior period tax positions | 11,479,000 | 11,965,000 | 8,640,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits increases resulting from current period tax positions | $ 9,073,000 | $ 15,411,000 | $ 10,133,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The estimated upper bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References No definition available. + Details
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- Definition The amount of costs incurred on unapproved change orders when it is probable that the cost will be recovered through a change in the contract price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c(3) -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6471523&loc=d3e50000-109363 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49324-109356 + Details
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- Definition Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet. + 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 210.5-02.3(c)(3)) -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 3 -Subparagraph c(3) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6471842&loc=d3e55302-109406 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The net amount of all increases and decreases in unrecognized tax benefits for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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