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Legal Contingencies - Additional Information (Detail) (USD $) | 1 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended
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Aug. 31, 2012 Amount of Claim of Indebt [Member] | Dec. 31, 2011 GPS [Member] | Apr. 30, 2009 GPS [Member] | Jan. 31, 2009 GPS [Member] | Oct. 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] | Oct. 31, 2014 Delta-T Corporation [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 |  |  |  |  |  |
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 |  |  |  |  | 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 |  | 6,100,000 |  |  |  |  |  |  |  |
Total payment made |  |  |  |  |  | $ 1,875,000 |  |  |  |

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