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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Schedule of costs and estimated earnings on uncompleted contracts and related amounts billed
Costs and estimated earnings on uncompleted contracts and related amounts billed as of December 31, 2015 and 2014 were as follows (in thousands):  
 
2015
 
2014
Costs incurred on uncompleted contracts
$
7,582,108

 
$
7,620,522

Estimated earnings, thereon
862,987

 
808,549

 
8,445,095

 
8,429,071

Less: billings to date
8,756,596

 
8,694,425

 
$
(311,501
)
 
$
(265,354
)
Such amounts were included in the accompanying Consolidated Balance Sheets at December 31, 2015 and 2014 under the following captions (in thousands):  
 
2015
 
2014
Costs and estimated earnings in excess of billings on uncompleted contracts
$
117,734

 
$
103,201

Billings in excess of costs and estimated earnings on uncompleted contracts
(429,235
)
 
(368,555
)
 
$
(311,501
)
 
$
(265,354
)