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Summary of Significant Accounting Policies - Schedule of costs and estimated earnings on uncompleted contracts and related amounts billed (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Accounting Policies [Abstract] |  |  |
Costs incurred on uncompleted contracts | $ 7,223,436 | $ 7,582,108 |
Estimated earnings, thereon | 827,799 | 862,987 |
Costs and estimated earnings on uncompleted contracts | 8,051,235 | 8,445,095 |
Less: billings to date | 8,409,780 | 8,756,596 |
Net billings in excess of costs | (358,545) | (311,501) |
Costs and estimated earnings in excess of billings on uncompleted contracts | 130,697 | 117,734 | $ 103,201
Billings in excess of costs and estimated earnings on uncompleted contracts | $ (489,242) | $ (429,235) | $ (368,555)

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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57807-111642 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57788-111642 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57795-111642 + Details
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