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Operating Segment and Related Information - Summary of Company's Geographic and Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Revenue $ 454,005 $ 413,084 $ 359,293 $ 331,744 $ 360,549 $ 277,467 $ 280,982 $ 201,808 $ 1,558,126 $ 1,120,806 $ 547,438
Depreciation and amortization                 24,493 24,796 6,719
Income (Loss) from Operations $ 5,120 $ 6,854 $ 5,978 $ (19,373) $ (5,843) $ 2,644 $ 3,422 $ 490 (1,421) 713 (13,991)
Capital Expenditures                 29,048 21,324 5,819
Construction                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Revenue                 502,658 513,770 348,318
Marine Services                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Revenue                 161,864 134,926 35,328
Insurance                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Revenue                 142,457 2,865 0
Telecommunications                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Revenue                 735,043 460,355 161,953
Energy                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Revenue                 6,430 6,765 1,839
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Revenue                 9,674 2,125 0
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Revenue                 1,115,337 712,498 442,472
United Kingdom                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Revenue                 417,933 395,917 97,653
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net Revenue                 24,856 12,391 7,313
Operating Segments | Construction                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Depreciation and amortization                 1,892 2,016 1,053
Income (Loss) from Operations                 49,639 42,114 26,358
Capital Expenditures                 8,243 4,969 5,039
Operating Segments | Marine Services                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Depreciation and amortization                 22,007 18,771 4,809
Income (Loss) from Operations                 (323) 10,898 (3,779)
Capital Expenditures                 12,231 10,651 (863)
Operating Segments | Insurance                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Depreciation and amortization                 (3,771) 2 0
Income (Loss) from Operations                 (812) (176) 0
Capital Expenditures                 128    
Operating Segments | Telecommunications                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Depreciation and amortization                 504 417 529
Income (Loss) from Operations                 4,150 238 (1,840)
Capital Expenditures                 831 449 42
Operating Segments | Energy                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Depreciation and amortization                 2,248 1,635 328
Income (Loss) from Operations                 (330) (888) (491)
Capital Expenditures                 7,211 4,750 803
Operating Segments | Life Sciences                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Depreciation and amortization                 124 21 0
Income (Loss) from Operations                 (10,389) (6,404) (4,762)
Capital Expenditures                 195 271 0
Operating Segments | Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Depreciation and amortization                 1,489 0 0
Income (Loss) from Operations                 (5,756) (6,198) (221)
Capital Expenditures                 45 234 798
Non-operating Corporate                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Depreciation and amortization                 0 1,934 0
Income (Loss) from Operations                 (37,600) (38,871) (29,256)
Capital Expenditures                 $ 164 $ 0 $ 0