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Discontinued operations (Tables)
 12 Months Ended
Mar. 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 following table summarizes the book value of the disposed pipeline related assets:
Inventory
$
1,254

Property, plant and equipment, gross
17,491

Accumulated depreciation
(5,459
)
Pipeline related assets
$
13,286

The results of pipeline discontinued operations are summarized as follows:
Year ended March 31,
2013

 
2012

 
2011

Revenue
$
35,901

 
$
150,504

 
$
85,452

Project costs
36,090

 
164,278

 
87,703

Depreciation
196

 
1,045

 
550

Gross loss
$
(385
)
 
$
(14,819
)
 
$
(2,801
)
General and administrative expenses
1,246

 
1,371

 
1,449

Gain on disposal of property, plant and equipment
(375
)
 
—

 
—

Recovery of previously expensed tools, supplies and equipment parts
(1,095
)
 
—

 
—

Gain on sale of inventory
(714
)
 
—

 
—

Operating Income (loss)
$
553

 
$
(16,190
)
 
$
(4,250
)
Interest expense
700

 
1,050

 
1,050

Loss before income taxes
$
(147
)
 
$
(17,240
)
 
$
(5,300
)
Deferred income tax expense (benefit)
173

 
(4,282
)
 
(1,389
)
Net loss from discontinued operations
$
(320
)
 
$
(12,958
)
 
$
(3,911
)
Cash provided by (used in) the pipeline discontinued operations is summarized as follows:
Year ended March 31,
2013

 
2012

 
2011

Operating activities
$
928

 
$
(16,195
)
 
$
(4,750
)
Investing activities
11,986

 
(4,110
)
 
(1,124
)
 
$
12,914

 
$
(20,305
)
 
$
(5,874
)
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 book value of the piling related assets classified as held for sale:
Accounts receivable, net
$
44,297

Unbilled revenue
9,324

Inventories
7,754

Prepaid expenses
181

Intangible assets
4,220

Property, plant and equipment, gross
83,359

Accumulated depreciation
(29,566
)
Goodwill
32,901

Deferred tax assets
2,270

Assets held for sale
$
154,740

The following table summarizes the book value of the piling related liabilities classified as held for sale:
Accounts payable
$
17,048

Accrued liabilities
23

Billings in excess
3,115

Capital lease obligation
5,927

Deferred tax liabilities
12,733

Liabilities held for sale
$
38,846

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

 
2012

 
2011

Revenue
$
236,459

 
$
185,321

 
$
105,559

Project costs
172,593

 
136,080

 
84,175

Equipment operating lease expense
2,315

 
2,315

 
1,071

Depreciation
3,592

 
3,213

 
3,828

Gross profit
$
57,959

 
$
43,713

 
$
16,485

General and administrative expenses
12,451

 
11,696

 
9,654

Amortization of intangible assets
1,408

 
1,415

 
1,390

Operating income
$
44,100

 
$
30,602

 
$
5,441

Interest expense
7,639

 
7,129

 
6,408

Income (loss) before income taxes
$
36,461

 
$
23,473

 
$
(967
)
Deferred income tax expense
9,295

 
6,294

 
46

Net income (loss) from discontinued operations
$
27,166

 
$
17,179

 
$
(1,013
)
Cash provided by (used in) the piling discontinued operations is summarized as follows:
Year ended March 31,
2013

 
2012

 
2011

Operating activities
$
37,263

 
$
22,370

 
$
16,431

Investing activities
(34,047
)
 
(8,184
)
 
(26,198
)
Financing activities
(848
)
 
(337
)
 
—

 
$
2,368

 
$
13,849

 
$
(9,767
)