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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 | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013 | Jan. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 127,564,000 | $ 63,452,000 | $ 280,785,000 | $ 167,964,000 |
Cost of revenues | 97,251,000 | 39,576,000 | 218,858,000 | 109,803,000 |
Gross profit | 30,313,000 | 23,876,000 | 61,927,000 | 58,161,000 |
Selling, general and administrative expenses | 5,473,000 | 3,545,000 | 13,332,000 | 8,589,000 |
Income (loss) from operations | 24,840,000 | 20,331,000 | 48,595,000 | 49,572,000 |
Gains on the deconsolidation of VIEs |  |  |  | 2,444,000 |
Other income, net | 99,000 | 261,000 | 162,000 | 827,000 |
Income (loss) before income taxes | 24,939,000 | 20,592,000 | 48,757,000 | 52,843,000 |
Income tax expense | 8,180,000 | 8,143,000 | 15,177,000 | 19,531,000 |
Net income | 16,759,000 | 12,449,000 | 33,580,000 | 33,312,000 |
Amortization of purchased intangibles | 61,000 | 61,000 | 182,000 | 182,000 |
Depreciation | 140,000 | 142,000 | 423,000 | 407,000 |
Property, plant and equipment additions | 1,643,000 | 84,000 | 1,842,000 | 942,000 |
Goodwill | 18,476,000 | 18,476,000 | 18,476,000 | 18,476,000 | 18,476,000
Total assets | 414,378,000 | 260,448,000 | 414,378,000 | 260,448,000 | 323,306,000
Power Industry Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 125,660,000 | 61,103,000 | 275,902,000 | 160,392,000 |
Cost of revenues | 95,863,000 | 38,012,000 | 215,174,000 | 104,062,000 |
Telecommunications Infrastructure Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 1,904,000 | 2,349,000 | 4,883,000 | 7,572,000 |
Cost of revenues | 1,388,000 | 1,564,000 | 3,684,000 | 5,741,000 |
Operating Segments [Member] | Power Industry Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 125,660,000 | 61,103,000 | 275,902,000 | 160,392,000 |
Cost of revenues | 95,863,000 | 38,012,000 | 215,174,000 | 104,062,000 |
Gross profit | 29,797,000 | 23,091,000 | 60,728,000 | 56,330,000 |
Selling, general and administrative expenses | 3,486,000 | 1,814,000 | 8,042,000 | 5,254,000 |
Income (loss) from operations | 26,311,000 | 21,277,000 | 52,686,000 | 51,076,000 |
Gains on the deconsolidation of VIEs |  |  |  | 2,444,000 |
Other income, net | 98,000 | 260,000 | 160,000 | 825,000 |
Income (loss) before income taxes | 26,409,000 | 21,537,000 | 52,846,000 | 54,345,000 |
Amortization of purchased intangibles | 61,000 | 61,000 | 182,000 | 182,000 |
Depreciation | 94,000 | 96,000 | 286,000 | 268,000 |
Property, plant and equipment additions | 1,629,000 | 69,000 | 1,718,000 | 880,000 |
Goodwill | 18,476,000 | 18,476,000 | 18,476,000 | 18,476,000 |
Total assets | 350,289,000 | 216,492,000 | 350,289,000 | 216,492,000 |
Operating Segments [Member] | Telecommunications Infrastructure Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 1,904,000 | 2,349,000 | 4,883,000 | 7,572,000 |
Cost of revenues | 1,388,000 | 1,564,000 | 3,684,000 | 5,741,000 |
Gross profit | 516,000 | 785,000 | 1,199,000 | 1,831,000 |
Selling, general and administrative expenses | 311,000 | 344,000 | 971,000 | 991,000 |
Income (loss) from operations | 205,000 | 441,000 | 228,000 | 840,000 |
Income (loss) before income taxes | 205,000 | 441,000 | 228,000 | 840,000 |
Depreciation | 43,000 | 45,000 | 129,000 | 137,000 |
Property, plant and equipment additions | 14,000 | 15,000 | 74,000 | 62,000 |
Total assets | 2,833,000 | 2,381,000 | 2,833,000 | 2,381,000 |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Selling, general and administrative expenses | 1,676,000 | 1,387,000 | 4,319,000 | 2,344,000 |
Income (loss) from operations | (1,676,000) | (1,387,000) | (4,319,000) | (2,344,000) |
Other income, net | 1,000 | 1,000 | 2,000 | 2,000 |
Income (loss) before income taxes | (1,675,000) | (1,386,000) | (4,317,000) | (2,342,000) |
Depreciation | 3,000 | 1,000 | 8,000 | 2,000 |
Property, plant and equipment additions |  |  | 50,000 |  |
Total assets | $ 61,256,000 | $ 41,575,000 | $ 61,256,000 | $ 41,575,000 |

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