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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]              
Cash and cash equivalents $ 144,159,000 $ 144,159,000 $ 309,153,000 $ 488,777,000 $ 188,948,000 $ 363,113,000 $ 394,701,000
Cash equivalents 17,900,000 17,900,000   247,800,000      
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          
Allowances for doubtful accounts on current receivable 6,210,000 6,210,000   5,215,000      
Revenue associated with change order   165,000,000          
Provision for contract receivable 52,542,000 52,542,000          
Current retainage balances 276,500,000 276,500,000   194,500,000      
Non-current retainage balances 17,100,000 17,100,000   50,800,000      
Unbilled receivables 223,900,000 223,900,000   179,200,000      
Decrease in fair value of reporting units considered, for impairment calculation       10.00%      
Percent change in contract estimates impact on operating results is less than this percentage   5.00%          
Change orders and/or claims 70,600,000 70,600,000   75,500,000      
Fiber Optic Licensing Terms, Minimum in years   5 years 5 years 5 years      
Fiber Optic Licensing Terms, Maximum in years   25 years 25 years 25 years      
Fiber optic deferred revenue 53,600,000 53,600,000   48,800,000      
Fiber optic non-current deferred revenue 45,600,000 45,600,000   40,200,000      
Total amount of unrecognized tax benefits relating to uncertain tax positions 49,400,000 49,400,000          
Amount of unrecognized tax benefits change from year-end relating to uncertain tax positions   600,000          
Unrecognized tax benefits increases resulting from current period tax positions   6,300,000          
Unrecognized tax benefits decreases resulting from prior period tax positions   5,700,000          
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months upper bound 12,100,000 12,100,000          
Selling, General and Administrative Expenses [Member]
              
Summary Of Significant Accounting Policies [Line Items]              
Provision for contract receivable 52,500,000 52,500,000          
Domestic Bank Accounts [Member]
              
Summary Of Significant Accounting Policies [Line Items]              
Cash and cash equivalents 43,800,000 43,800,000   236,700,000      
Foreign Bank Accounts [Member]
              
Summary Of Significant Accounting Policies [Line Items]              
Cash and cash equivalents $ 100,400,000 $ 100,400,000   $ 252,100,000      
Restricted Stock Units to be Settled in Cash [Member]
              
Summary Of Significant Accounting Policies [Line Items]              
Number of common stock shares that may be received by RSU holder   1          
Maximum [Member]
              
Summary Of Significant Accounting Policies [Line Items]              
Equity method investment ownership 50.00% 50.00%          
Maximum [Member] | Restricted Stock Units to be Settled in Cash [Member]
              
Summary Of Significant Accounting Policies [Line Items]              
Vesting period for restricted stock units to be settled in cash   3 years          
Minimum [Member]
              
Summary Of Significant Accounting Policies [Line Items]              
Equity method investment ownership 20.00% 20.00%          
Minimum [Member] | Restricted Stock Units to be Settled in Cash [Member]
              
Summary Of Significant Accounting Policies [Line Items]              
Vesting period for restricted stock units to be settled in cash   2 years