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Summary Of Significant Accounting Policies (Narrative) (Detail) (USD $)
 9 Months Ended 1 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
Howard Midstream Energy Partners, LLC [Member]
Jun. 30, 2012
Howard Midstream Energy Partners, LLC [Member]
Apr. 30, 2012
Howard Midstream Energy Partners, LLC [Member]
Jun. 22, 2011
Howard Midstream Energy Partners, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]                    
Cash and cash equivalents $ 128,210,000 $ 257,838,000 $ 172,868,000 $ 315,349,000 $ 380,382,000 $ 539,221,000        
Cash equivalents 16,500,000     165,900,000            
Cash and cash equivalents held in domestic bank accounts 2,200,000     230,900,000            
Cash and cash equivalents held in foreign bank accounts 126,000,000     84,400,000            
Number of days after accounts receivable are treated as delinquent 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 5,594,000     3,763,000            
Current retainage balances 205,700,000     117,100,000            
Non-current retainage balances 23,200,000     28,300,000            
Unbilled receivables 193,000,000     140,800,000            
Decrease in fair value of reporting units considered, for impairment calculation       10.00%            
Acquired ownership interest in HEP                 31.00% 39.00%
Payment to acquire equity method investment 53,750,000 35,000,000         35,000,000 52,300,000    
Number of shares acquired in equity method investment                 45,435  
Change orders and/or claims 206,600,000     77,300,000            
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 45,800,000     47,400,000            
Fiber optic non-current deferred revenue 36,900,000     38,300,000            
Unrecognized tax benefits 48,200,000                  
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions 10,000,000                  
Reductions due to expiration of statutes of limitations 9,200,000                  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound 11,100,000                  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound 0                  
Unrecognized tax benefits increase (decrease) $ 800,000