Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Summary of Intangible Assets (Detail)

v2.4.0.8
Intangible Assets - Summary of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Mar. 31, 2013
Schedule Of Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross Carrying Amount $ 2,870 $ 2,870
Finite-Lived Intangible Assets, Accumulated Amortization 717 582
Finite-Lived Intangible Assets, Net Carrying Amount 2,153 2,288
Indefinite Lived Intangible Assets, Gross Carrying Amount 12,800 12,800
Indefinite Lived Intangible Assets, Net Carrying Amount 12,800 12,800
Backlog [Member]
   
Schedule Of Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross Carrying Amount 170 170
Finite-Lived Intangible Assets, Accumulated Amortization 170 170
Finite-Lived Intangible Assets, Net Carrying Amount      
Customer Relationships [Member]
   
Schedule Of Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross Carrying Amount 2,700 2,700
Finite-Lived Intangible Assets, Accumulated Amortization 547 412
Finite-Lived Intangible Assets, Net Carrying Amount 2,153 2,288
Nuclear Permits [Member]
   
Schedule Of Intangible Assets [Line Items]    
Indefinite Lived Intangible Assets, Gross Carrying Amount 10,300 10,300
Indefinite Lived Intangible Assets, Net Carrying Amount 10,300 10,300
Trade name [Member]
   
Schedule Of Intangible Assets [Line Items]    
Indefinite Lived Intangible Assets, Gross Carrying Amount 2,500 2,500
Indefinite Lived Intangible Assets, Net Carrying Amount $ 2,500 $ 2,500