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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016 were as follows (in thousands):  
 
2017
 
2016
Costs incurred on uncompleted contracts
$
8,258,802

 
$
7,223,436

Estimated earnings, thereon
1,081,509

 
827,799

 
9,340,311

 
8,051,235

Less: billings to date
9,741,846

 
8,409,780

 
$
(401,535
)
 
$
(358,545
)
Such amounts were included in the accompanying Consolidated Balance Sheets at December 31, 2017 and 2016 under the following captions (in thousands):  
 
2017
 
2016
Costs and estimated earnings in excess of billings on uncompleted contracts
$
122,621

 
$
130,697

Billings in excess of costs and estimated earnings on uncompleted contracts
(524,156
)
 
(489,242
)
 
$
(401,535
)
 
$
(358,545
)