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Discontinued operations (Tables)
 12 Months Ended
Dec. 31, 2013
Pipeline
  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Schedule of disposed assets, results of discontinued operations and cashflow impact of discontinued operations
The results of pipeline discontinued operations are summarized as follows:
Year ended December 31,
2013

 
2012

Revenue
$
—

 
$
84,399

Project costs
1,321

 
93,442

Depreciation
—

 
556

Gross loss
$
(1,321
)
 
$
(9,599
)
General and administrative expenses
312

 
1,277

Loss (gain) on disposal of property, plant and equipment
63

 
(438
)
Recovery of previously expensed tools, supplies and equipment parts
—

 
(1,095
)
Gain on sale of inventory
(46
)
 
(668
)
Operating loss
$
(1,650
)
 
$
(8,675
)
Interest expense
—

 
962

Loss before income taxes
$
(1,650
)
 
$
(9,637
)
Deferred income tax benefit
(510
)
 
(2,003
)
Net loss from discontinued operations
$
(1,140
)
 
$
(7,634
)
Cash (used in) provided by the pipeline discontinued operations is summarized as follows:
Year ended December 31,
2013

 
2012

Operating activities
$
(1,587
)
 
$
(8,267
)
Investing activities
—

 
11,197

 
$
(1,587
)
 
$
2,930
Piling
  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Schedule of disposed assets, results of discontinued operations and cashflow impact of discontinued operations
The following table summarizes the transaction:
Proceeds
$
227,500

Working capital adjustment
(5,863
)
Capital lease liability
5,869

Selling and disposal costs
8,102

Net proceeds
$
219,392

Non-cash working capital
33,699

Property, plant and equipment, net
56,377

Intangibles
4,219

Goodwill
32,901

Capital lease obligation
(5,869
)
Net gain
$
98,065

The results of piling discontinued operations are summarized as follows:
Year ended December 31,
2013

 
2012

Revenue
$
98,735

 
$
242,106

Project costs
79,472

 
178,970

Equipment operating lease expense
1,242

 
2,315

Depreciation
706

 
3,706

Gross profit
$
17,315

 
$
57,115

General and administrative expenses
6,857

 
12,518

Amortization of intangible assets
351

 
1,410

Gain on disposal of piling assets and liabilities
(98,065
)
 
—

Operating income
$
108,172

 
$
43,187

Interest expense
4,758

 
7,557

Income before income taxes
$
103,414

 
$
35,630

Current income tax expense
164

 
—

Deferred income tax expense
14,879

 
9,173

Net income from discontinued operations
$
88,371

 
$
26,457

Cash provided by (used in) the piling discontinued operations is summarized as follows:
Year ended December 31,
2013

 
2012

Operating activities
$
47,326

 
$
6,373

Investing activities
182,836

 
(5,270
)
Financing activities
(271
)
 
(720
)
 
$
229,891

 
$
383