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Summary of Significant Accounting Policies (Revenue Recognition) - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Project
Jun. 30, 2015
USD ($)
Project
Jun. 30, 2016
USD ($)
Project
Jun. 30, 2015
USD ($)
Project
Dec. 31, 2015
USD ($)
Revenue recognized for current period losses [Line Items]          
Loss on Contracts $ 30,500,000 $ 31,800,000 $ 51,800,000 $ 48,200,000  
Contract value of project $ 201,000,000   $ 201,000,000    
Project completion percentage 90.00%   90.00%    
Revenues $ 1,792,430,000 $ 1,872,340,000 $ 3,506,167,000 $ 3,733,726,000  
Percent change in contract estimates impact on operating results is less than this percentage   5.00%   5.00%  
Decrease in operating results due to change in contract estimates, percentage 9.20%   6.70%    
Change in contract estimates impact on operating results value gains identified that offset against losses disclosed   $ 8,500,000   $ 21,000,000  
Number of projects with significant losses | Project 1 3 1 3  
Change orders and/or claims $ 106,000,000   $ 106,000,000   $ 137,200,000
Alaska Power Plant Construction Project [Member]          
Revenue recognized for current period losses [Line Items]          
Revenues     $ 0