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Discontinued operations
 12 Months Ended
Mar. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued operations
Discontinued operations
During the year ended March 31, 2013, the Company elected to sell its pipeline related assets and piling related assets and discontinue the operations of these businesses. Prior to this decision, the Company had two reportable business segments consisting of Heavy Construction and Mining and Commercial and Industrial Construction. The Commercial and Industrial Construction segment was comprised of pipeline and piling operations. The operations and balance sheets of the discontinued Commercial and Industrial Construction segment are summarized in this note and the Heavy Construction and Mining operations and balance sheet are presented on the face of the financial statements.
a) Pipeline
On November 22, 2012, the Company reached an agreement with an independent third party to sell its pipeline integrity and maintenance industry related assets for total consideration of approximately $16,250. The selling costs were $781 rendering net proceeds of $15,469. The Company does not have any continuing significant involvement in the operations of pipeline. For all periods presented, the results of its pipeline operations and cash flows have been reported as 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
)

b) Piling
At March 31, 2013, as part of its ongoing strategic evaluation of operations, the Company made the decision to sell its piling assets and liabilities, excluding accounts receivable and unbilled revenue on a certain customer contract, and exit the piling, foundation, pipeline anchor and tank services businesses. On June 10, 2013, the Company reached an agreement with Keller Group plc (the "Purchaser") to sell its piling assets and liabilities, subject to majority approval by the Purchaser's shareholders and subject to the Purchaser securing certain anti-trust approvals, for initial consideration of approximately $227,500, plus or minus customary working capital adjustments, less capital lease obligations at the closing date. The terms of the agreement entitle the Company to additional proceeds of $92,500 over the next three years, contingent on the Purchaser achieving prescribed profit milestones from the piling business. These contingent proceeds will be recognized as the profit milestones are achieved. The assets and liabilities being sold have been classified as held for sale on the Consolidated Balance Sheets. Upon finalization of the sale the Company will not have any significant continuing involvement in piling operations. For all periods presented, the results of piling operations and cash flows are included in 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
)