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Segment Reporting - Summarized Operating Results and Certain Financial Position Data of Company's Reportable Continuing Business Segments (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 59,491,000 | $ 63,452,000 | $ 57,864,000 | $ 46,648,000 | $ 57,840,000 | $ 74,486,000 | $ 82,619,000 | $ 63,690,000 | $ 227,455,000 | $ 278,635,000 | $ 141,850,000
Cost of revenues |  |  |  |  |  |  |  |  | 148,607,000 | 228,500,000 | 118,748,000
Gross profit | 20,687,000 | 23,876,000 | 21,257,000 | 13,028,000 | 14,019,000 | 13,136,000 | 12,879,000 | 10,101,000 | 78,848,000 | 50,135,000 | 23,102,000
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 12,918,000 | 14,350,000 | 11,186,000
Income (loss) from operations |  |  |  |  |  |  |  |  | 65,930,000 | 35,785,000 | 11,916,000
Gains on the deconsolidation of VIEs |  |  |  |  |  |  |  |  | 2,444,000 |  |
Other income (expense), net |  |  |  |  |  |  |  |  | 961,000 | (43,000) | 48,000
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 69,335,000 | 35,742,000 | 11,964,000
Income tax expense |  |  |  |  |  |  |  |  | 25,991,000 | 13,640,000 | 4,556,000
Income from continuing operations | 10,032,000 | 12,449,000 | 13,923,000 | 6,940,000 | 5,861,000 | 5,713,000 | 5,981,000 | 4,547,000 | 43,344,000 | 22,102,000 | 7,408,000
Amortization of purchased intangible assets |  |  |  |  |  |  |  |  | 243,000 | 243,000 | 334,000
Depreciation |  |  |  |  |  |  |  |  | 549,000 | 522,000 | 455,000
Fixed asset additions |  |  |  |  |  |  |  |  | 1,136,000 | 7,263,000 | 1,738,000
Goodwill | 18,476,000 |  |  |  | 18,476,000 |  |  |  | 18,476,000 | 18,476,000 | 18,476,000
Total assets | 323,306,000 |  |  |  | 234,724,000 |  |  |  | 323,306,000 | 234,724,000 | 205,252,000
Current assets | 298,559,000 |  |  |  | 204,108,000 |  |  |  | 298,559,000 | 204,108,000 | 180,577,000
Current liabilities | 165,236,000 |  |  |  | 115,546,000 |  |  |  | 165,236,000 | 115,546,000 | 104,279,000
Power Industry Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 218,649,000 | 261,327,000 | 132,519,000
Cost of revenues |  |  |  |  |  |  |  |  | 141,807,000 | 214,817,000 | 111,193,000
Telecommunications Infrastructure Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 8,806,000 | 17,308,000 | 9,331,000
Cost of revenues |  |  |  |  |  |  |  |  | 6,800,000 | 13,683,000 | 7,555,000
Operating Segments [Member] | Power Industry Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 218,649,000 | 261,327,000 | 132,519,000
Cost of revenues |  |  |  |  |  |  |  |  | 141,807,000 | 214,817,000 | 111,193,000
Gross profit |  |  |  |  |  |  |  |  | 76,842,000 | 46,510,000 | 21,326,000
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 7,575,000 | 7,950,000 | 6,235,000
Income (loss) from operations |  |  |  |  |  |  |  |  | 69,267,000 | 38,560,000 | 15,091,000
Gains on the deconsolidation of VIEs |  |  |  |  |  |  |  |  | 2,444,000 |  |
Other income (expense), net |  |  |  |  |  |  |  |  | 958,000 | (45,000) | 33,000
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 72,669,000 | 38,515,000 | 15,124,000
Amortization of purchased intangible assets |  |  |  |  |  |  |  |  | 243,000 | 243,000 | 334,000
Depreciation |  |  |  |  |  |  |  |  | 366,000 | 290,000 | 207,000
Fixed asset additions |  |  |  |  |  |  |  |  | 1,067,000 | 6,986,000 | 1,598,000
Goodwill | 18,476,000 |  |  |  | 18,476,000 |  |  |  | 18,476,000 | 18,476,000 | 18,476,000
Total assets | 276,744,000 |  |  |  | 186,284,000 |  |  |  | 276,744,000 | 186,284,000 | 164,049,000
Current assets | 252,603,000 |  |  |  | 158,567,000 |  |  |  | 252,603,000 | 158,567,000 | 141,561,000
Current liabilities | 163,534,000 |  |  |  | 110,828,000 |  |  |  | 163,534,000 | 110,828,000 | 101,709,000
Operating Segments [Member] | Telecommunications Infrastructure Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 8,806,000 | 17,308,000 | 9,331,000
Cost of revenues |  |  |  |  |  |  |  |  | 6,800,000 | 13,683,000 | 7,555,000
Gross profit |  |  |  |  |  |  |  |  | 2,006,000 | 3,625,000 | 1,776,000
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 1,331,000 | 1,628,000 | 1,586,000
Income (loss) from operations |  |  |  |  |  |  |  |  | 675,000 | 1,997,000 | 190,000
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 675,000 | 1,997,000 | 190,000
Depreciation |  |  |  |  |  |  |  |  | 180,000 | 229,000 | 244,000
Fixed asset additions |  |  |  |  |  |  |  |  | 69,000 | 277,000 | 136,000
Total assets | 1,989,000 |  |  |  | 4,032,000 |  |  |  | 1,989,000 | 4,032,000 | 3,121,000
Current assets | 1,293,000 |  |  |  | 3,486,000 |  |  |  | 1,293,000 | 3,486,000 | 2,626,000
Current liabilities | 511,000 |  |  |  | 1,346,000 |  |  |  | 511,000 | 1,346,000 | 1,065,000
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 4,012,000 | 4,772,000 | 3,365,000
Income (loss) from operations |  |  |  |  |  |  |  |  | (4,012,000) | (4,772,000) | (3,365,000)
Other income (expense), net |  |  |  |  |  |  |  |  | 3,000 | 2,000 | 15,000
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (4,009,000) | (4,770,000) | (3,350,000)
Depreciation |  |  |  |  |  |  |  |  | 3,000 | 3,000 | 4,000
Fixed asset additions |  |  |  |  |  |  |  |  |  |  | 4,000
Total assets | 44,573,000 |  |  |  | 44,408,000 |  |  |  | 44,573,000 | 44,408,000 | 38,082,000
Current assets | 44,663,000 |  |  |  | 42,055,000 |  |  |  | 44,663,000 | 42,055,000 | 36,390,000
Current liabilities | $ 1,191,000 |  |  |  | $ 3,372,000 |  |  |  | $ 1,191,000 | $ 3,372,000 | $ 1,505,000

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