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Discontinued operations
 12 Months Ended
Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued operations
Discontinued operations
In prior years, the Company disposed of two businesses, comprising the commercial and industrial construction segment, and classified their results as discontinued operations. On November 22, 2012, the Company sold its pipeline related assets and exited the pipeline business. On July 12, 2013, the Company sold its piling related assets and liabilities, excluding accounts receivable and unbilled revenue on a certain customer contract, and exited the piling, foundation, pipeline anchor and tank services businesses. The terms of the piling sale agreement entitled the Company to additional proceeds of up to $92,500 over the three years following the sale, contingent on the purchaser achieving certain "net income before interest expense, income taxes, depreciation and amortization" ("Piling Business EBITDA") thresholds from the assets and liabilities sold. The Company has determined that it is very unlikely that it will realize any of the potential additional proceeds.
During the year ended December 31, 2014, the Company recorded a net loss of $472 to discontinued operations related to closing costs on a certain customer contract not sold to the purchaser and costs related to the review of the first year contingent proceeds.

Year ended December 31,
 
2013
  
 
Pipeline

 
Piling

 
Total

Revenue
 
$
—

 
$
98,735

 
$
98,735

Project costs
 
1,321

 
79,472

 
80,793

Equipment costs
 
—

 
1,242

 
1,242

Depreciation
 
—

 
706

 
706

Gross (loss) profit
 
$
(1,321
)
 
$
17,315

 
$
15,994

General and administrative expenses
 
312

 
6,857

 
7,169

Loss (gain) on disposal of assets and liabilities
 
63

 
(98,065
)
 
(98,002
)
Gain on sale of inventory
 
(46
)
 
—

 
(46
)
Amortization of intangible assets
 
—

 
351

 
351

Operating (loss) income
 
$
(1,650
)
 
$
108,172

 
$
106,522

Interest expense
 
—

 
4,758

 
4,758

(Loss) income before income taxes
 
$
(1,650
)
 
$
103,414

 
$
101,764

Current income tax expense
 
—

 
164

 
164

Deferred income tax (benefit) expense
 
(510
)
 
14,879

 
14,369

Net (loss) income
 
$
(1,140
)
 
$
88,371

 
$
87,231

Cash (used in) provided by discontinued operations during the prior year are summarized as follows:
Year ended December 31,
 
2013
  
 
Pipeline

 
Piling

 
Total

Operating activities
 
$
(1,587
)
 
$
47,326

 
$
45,739

Investing activities
 
—

 
182,836

 
182,836

Financing activities
 
—

 
(271
)
 
(271
)
 
 
$
(1,587
)
 
$
229,891

 
$
228,304