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Business Segment Information (Tables)
 12 Months Ended
Dec. 31, 2015
Segment Reporting [Abstract]  
Schedule of financial data by reportable segment
Certain financial data by reportable segment are summarized as follows (in thousands): 
 
Year Ended December 31,
 
2015
 
2014
 
2013
Net revenues —
 
 
 
 
 
Well Intervention
$
373,301

 
$
667,849

 
$
452,452

Robotics
301,026

 
420,224

 
333,246

Production Facilities
75,948

 
93,175

 
88,149

Subsea Construction
—

 
358

 
71,321

Intercompany elimination
(54,473
)
 
(74,450
)
 
(68,607
)
Total
$
695,802

 
$
1,107,156

 
$
876,561

Income (loss) from operations —
 
 
 
 
 
Well Intervention (1)
$
(194,381
)
 
$
204,810

 
$
131,840

Robotics
27,832

 
68,329

 
44,132

Production Facilities (2)
(106,847
)
 
41,138

 
49,778

Subsea Construction (3)
(52
)
 
10,923

 
33,685

Corporate and other
(33,814
)
 
(62,523
)
 
(77,041
)
Intercompany elimination
(98
)
 
(921
)
 
(3,360
)
Total
$
(307,360
)
 
$
261,756

 
$
179,034

Net interest expense —
 
 
 
 
 
Well Intervention
$
(102
)
 
$
(252
)
 
$
(128
)
Robotics
29

 
(5
)
 
19

Production Facilities
385

 
384

 
380

Corporate and eliminations (4)
26,602

 
17,732

 
32,627

Total
$
26,914

 
$
17,859

 
$
32,898

 
 
 
 
 
 
Equity in earnings (losses) of investments
$
(124,345
)
 
$
879

 
$
2,965

Income (loss) before income taxes —
 
 
 
 
 
Well Intervention (1)
$
(193,572
)
 
$
211,725

 
$
132,057

Robotics (5)
2,454

 
61,025

 
44,342

Production Facilities (2)
(231,577
)
 
41,633

 
52,363

Subsea Construction (3)
53

 
11,201

 
33,205

Corporate and eliminations
(55,528
)
 
(63,063
)
 
(118,379
)
Total
$
(478,170
)
 
$
262,521

 
$
143,588

Income tax provision (benefit) —
 
 
 
 
 
Well Intervention
$
(1,230
)
 
$
50,102

 
$
26,718

Robotics
515

 
21,612

 
15,530

Production Facilities
(81,052
)
 
14,395

 
17,233

Subsea Construction
26

 
3,881

 
11,655

Corporate and eliminations
(19,449
)
 
(23,019
)
 
(39,524
)
Total
$
(101,190
)
 
$
66,971

 
$
31,612

 
Year Ended December 31,
 
2015
 
2014
 
2013
Identifiable assets —
 
 
 
 
 
Well Intervention
$
1,492,901

 
$
1,470,349

 
$
1,245,229

Robotics
274,926

 
299,701

 
282,373

Production Facilities
182,007

 
459,427

 
495,829

Subsea Construction
10,027

 
27,547

 
38,054

Corporate and other
452,091

 
443,674

 
482,795

Total
$
2,411,952

 
$
2,700,698

 
$
2,544,280

Capital expenditures —
 
 
 
 
 
Well Intervention
$
307,879

 
$
283,635

 
$
283,132

Robotics
10,700

 
51,348

 
39,655

Production Facilities
1,867

 
869

 
1,252

Corporate and other
(135
)
 
1,060

 
387

Total
$
320,311

 
$
336,912

 
$
324,426

Depreciation and amortization —
 
 
 
 
 
Well Intervention
$
66,095

 
$
57,570

 
$
44,619

Robotics
26,724

 
24,478

 
22,263

Production Facilities
21,340

 
21,278

 
17,193

Subsea Construction
—

 
—

 
8,651

Corporate and eliminations
6,242

 
6,019

 
5,809

Total
$
120,401

 
$
109,345

 
$
98,535

(1)
Amount in 2015 includes impairment charges of $205.2 million for the Helix 534 and $6.3 million for certain capitalized vessel project costs and a $16.4 million impairment charge on goodwill related to our U.K. well intervention reporting unit.
(2)
Amount in 2015 includes a $133.4 million impairment charge for the HP I.
(3)
Amount in 2014 includes the $10.5 million gain on the sale of our Ingleside spoolbase in January 2014. Amount in 2013 includes the $1.1 million loss on the sale of the Caesar in June 2013 and the $15.6 million gain on the sale of the Express in July 2013.
(4)
Amount in 2014 includes $16.9 million of income with $7.2 million from an insurance reimbursement related to asset retirement work previously performed and the remaining income associated with our overriding royalty interests in ERT’s Wang well, which commenced production in April 2013. Amount in 2013 includes the $12.1 million loss on early extinguishment of debt.
(5)
Amount in 2015 includes unrealized losses totaling $18.3 million on our foreign currency exchange contracts associated with the Grand Canyon, Grand Canyon II and Grand Canyon III chartered vessels.
Summary of intercompany segment revenues
Intercompany segment revenues are as follows (in thousands): 
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
 
 
 
 
 
Well Intervention
$
22,855

 
$
29,875

 
$
22,448

Robotics
31,618

 
44,575

 
41,169

Production Facilities
—

 
—

 
4,673

Subsea Construction
—

 
—

 
317

Total
$
54,473

 
$
74,450

 
$
68,607
Schedule of revenue by individually significant region
Revenues by individually significant region are as follows (in thousands): 
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
 
 
 
 
 
United States
$
298,391

 
$
403,994

 
$
345,525

North Sea (1)
263,438

 
504,016

 
403,816

Other
133,973

 
199,146

 
127,220

Total
$
695,802

 
$
1,107,156

 
$
876,561

(1)
Includes revenues of $187.7 million, $362.7 million and $327.1 million, respectively, which were from the U.K.
Schedule of property and equipment, net of accumulated depreciation, by individually significant region
The following table provides our property and equipment, net of accumulated depreciation, by individually significant geographic location of our assets (in thousands): 
 
December 31,
 
2015
 
2014
 
 
 
 
United States
$
1,024,691

 
$
893,106

United Kingdom
352,740

 
355,996

Singapore (1)
112,313

 
434,319

Other
113,265

 
51,963

Total
$
1,603,009

 
$
1,735,384


(1)
Primarily includes vessels under construction.