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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
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