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Legal Contingencies - Additional Information (Detail) (USD $) |  | 1 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
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Aug. 31, 2012 Payment Received from the Parent Company of Delta-T [Member] | Jul. 31, 2012 Amount Included in Cost of Revenue [Member] | Aug. 31, 2012 Amount of Claim of Indebt [Member] | Sep. 19, 2007 Tampa Bay Nutraceutical Company [Member] | Dec. 31, 2011 GPS [Member] | Apr. 30, 2009 GPS [Member] | Jan. 31, 2009 GPS [Member] | Jan. 31, 2014 GPS [Member] | Aug. 31, 2012 GPS [Member] | Jan. 31, 2009 GPS [Member] Procurement and Construction Services Related to Nebraska Project [Member] | Mar. 31, 2008 GPS [Member] Procurement and Construction Services Related to Nebraska Project [Member] | Apr. 30, 2009 Delta-T Corporation [Member] | Jan. 31, 2009 Delta-T Corporation [Member] | Jan. 31, 2014 Vitarich Laboratories Inc [Member] Tampa Bay Nutraceutical Company [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
GPS mechanics lien against Nebraska project |  |  | $ 1,800,000 |  |  |  |  |  |  |  | $ 23,800,000 |  |  |
Net processed held by the bankruptcy court |  |  |  |  |  |  |  | 5,500,000 |  |  |  |  |  |
Settlement payment made by GPS to Delta-T under the project Close-Out Agreement |  |  |  |  |  |  | 3,500,000 |  |  |  |  |  |  |
Assignment to GPS of first receipts of Delta-T |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 |
Amount of lien rights assigned by Delta-T to GPS |  |  |  |  |  |  |  |  |  | 21,200,000 |  |  |  |
Arbitration award in favor of DCR against Delta-T |  |  |  |  |  |  |  |  |  |  |  | 6,800,000 |  |
Lawsuit filing dates |  |  |  | September, 2007 | December, 2011 |  |  |  |  |  |  | April, 2009 |  |
Amended amount of complaint filed against surety bonding company by DCR |  |  |  |  |  | 6,800,000 |  |  |  |  |  |  |  |
Damages sought by DCR from GPS |  |  |  |  | $6.1 million plus interest, costs and attorney fees |  |  |  |  |  |  |  |  |
Claims sought |  |  |  | 42,000,000 | 6,100,000 |  |  |  |  |  |  |  |  |
Total payment made | 275,000 |  |  |  |  |  |  |  | 1,875,000 |  |  |  |  |
Amount included in cost of revenue |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Provision for loss |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Allegations by Tampa Bay |  |  |  | Tampa Bay alleges compensatory damages in excess of $42 million |  |  |  |  |  |  |  |  |  |
Accrued liability in financial statements for expected litigation costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,304,000

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