Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
CONTRACT REVENUES	$ 767,585	$ 856,878	$ 806,831
Costs of contract revenues	(681,197)	(760,955)	(714,335)
GROSS PROFIT	86,388	95,923	92,496
General and administrative expenses	65,533	71,069	67,911
Impairment of goodwill	0	2,750
(GAIN) LOSS ON SALE OF ASSETS—Net	6,175	(855)	732
Total operating income	14,680	22,959	23,853
Interest income (expense)—net	(22,907)	(24,365)	(19,967)
Equity in earnings (loss) of joint ventures	(2,365)	(6,051)	2,895
Gain on bargain purchase acquisition			2,197
Other income (expense)	(3,377)	(1,229)	210
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(13,969)	(8,686)	9,188
Income tax (provision) benefit	5,792	2,497	11,530
Income (loss) from continuing operations	(8,177)	(6,189)	20,718
Loss from discontinued operations, net of income taxes			(10,423)
NET INCOME (LOSS)	(8,177)	(6,189)	10,295
Comprehensive income (loss)	(7,339)	(7,438)	10,034
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
CONTRACT REVENUES	767,723	845,889	799,579
Costs of contract revenues	(675,844)	(750,509)	(707,474)
GROSS PROFIT	91,879	95,380	92,105
General and administrative expenses	65,578	71,069	67,905
Impairment of goodwill		2,750
(GAIN) LOSS ON SALE OF ASSETS—Net	6,175	(855)	732
Total operating income	20,126	22,416	23,468
Interest income (expense)—net	488	(526)	61
Equity in earnings (loss) of subsidiaries	(10)	8	20
Equity in earnings (loss) of joint ventures	(2,365)	(6,051)	2,895
Gain on bargain purchase acquisition			2,197
Other income (expense)	(3,369)	(1,222)	203
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	14,870	14,625	28,844
Income tax (provision) benefit	1,079	1,505	(18,173)
Income (loss) from continuing operations			10,671
Loss from discontinued operations, net of income taxes			(10,423)
NET INCOME (LOSS)	15,949	16,130	248
Comprehensive income (loss)	16,279	16,130	49
Non Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
CONTRACT REVENUES	1,959	13,698	26,282
Costs of contract revenues	(7,450)	(13,155)	(25,891)
GROSS PROFIT	(5,491)	543	391
General and administrative expenses	4		6
Total operating income	(5,495)	543	385
Interest income (expense)—net			(261)
Other income (expense)	(8)	(7)	7
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(5,503)	536	131
Income tax (provision) benefit	(143)	(376)	(409)
Income (loss) from continuing operations			(278)
Loss from discontinued operations, net of income taxes			(1,343)
NET INCOME (LOSS)	(5,646)	160	(1,621)
Comprehensive income (loss)	(5,138)	(1,089)	(1,683)
GLDD Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
General and administrative expenses	(49)
Total operating income	49
Interest income (expense)—net	(23,395)	(23,839)	(19,767)
Equity in earnings (loss) of subsidiaries	10,313	16,282	10,373
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(13,033)	(7,557)	(9,394)
Income tax (provision) benefit	4,856	1,368	30,112
Income (loss) from continuing operations			20,718
Loss from discontinued operations, net of income taxes			(10,423)
NET INCOME (LOSS)	(8,177)	(6,189)	10,295
Comprehensive income (loss)	(7,339)	(7,438)	10,034
Consolidation Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
CONTRACT REVENUES	(2,097)	(2,709)	(19,030)
Costs of contract revenues	2,097	2,709	19,030
Equity in earnings (loss) of subsidiaries	(10,303)	(16,290)	(10,393)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(10,303)	(16,290)	(10,393)
Income (loss) from continuing operations			(10,393)
Loss from discontinued operations, net of income taxes			11,766
NET INCOME (LOSS)	(10,303)	(16,290)	1,373
Comprehensive income (loss)	$ (11,141)	$ (15,041)	$ 1,634