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Segment Information (Segment Reporting By Segment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
CONTRACT REVENUES $ 767,585 $ 856,878 $ 806,831
Operating income (loss) 14,680 22,959 23,853
Depreciation and amortization 63,023 64,585 50,129
Total assets 893,588 898,124 889,732
PROPERTY AND EQUIPMENT—Net 413,008 430,210 399,445
GOODWILL 83,576 83,576 86,326
INVESTMENTS IN JOINT VENTURES 4,734 3,761 7,889
Capital expenditures 85,212 89,279 92,078
Dredging Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income (loss) 34,108 64,073 41,620
Depreciation and amortization 54,826 50,556 43,620
Total assets 912,880 872,297 812,181
PROPERTY AND EQUIPMENT—Net 399,479 397,468 366,027
GOODWILL 76,576 76,576 76,576
INVESTMENTS IN JOINT VENTURES 381 1 2,114
Capital expenditures 84,263 82,000 79,186
Environmental And Infrastructure Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income (loss) (19,428) (41,114) (17,767)
Depreciation and amortization 8,197 14,029 6,509
Total assets 81,166 127,907 134,324
PROPERTY AND EQUIPMENT—Net 13,529 32,742 33,418
GOODWILL 7,000 7,000 9,750
INVESTMENTS IN JOINT VENTURES 4,353 3,760 5,775
Capital expenditures 949 7,279 12,892
Operating Segment [Member] | Dredging Segment [Member]      
Segment Reporting Information [Line Items]      
CONTRACT REVENUES 637,468 681,255 697,711
Operating Segment [Member] | Environmental And Infrastructure Segment [Member]      
Segment Reporting Information [Line Items]      
CONTRACT REVENUES 133,637 181,710 114,412
Intersegment Revenue [Member]      
Segment Reporting Information [Line Items]      
CONTRACT REVENUES (3,520) (6,087) (5,292)
Total assets $ (100,458) $ (102,080) $ (56,773)