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Discontinued operations
 12 Months Ended
Dec. 31, 2014
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 entitle 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" ("EBITDA") thresholds from the assets and liabilities sold.
During the year ended December 31, 2014 the Company recorded costs 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. The detailed discontinued operations results for the prior year are as follows:
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