Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v2.4.0.8
Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Income Taxes [Line Items]        
Deferred income taxes include the impact of state investment tax credits $ 298      
State investment tax credits with an unlimited carryforward period 440      
Valuation allowance 738 564    
Liability unrecognized tax benefits 0 134   1,787
Reduction in liability for unrecognized tax benefits 134 893    
Unrecognized tax benefits, reversal of interest expense on income taxes (11) (320)    
Unrecognized tax benefits, interest expense on income taxes     259  
Penalties related to uncertain tax positions $ 0 $ 0 $ 0  
Maximum [Member]
        
Income Taxes [Line Items]        
Expire date of state investment tax credits 2028      
Maximum [Member] | Internal Revenue Service (IRS) [Member]
        
Income Taxes [Line Items]        
Federal and State tax jurisdictions for tax period 2012      
Maximum [Member] | Federal Tax Jurisdictions [Member]
        
Income Taxes [Line Items]        
Federal and State tax jurisdictions for tax period 2013      
Maximum [Member] | State Tax Jurisdictions [Member]
        
Income Taxes [Line Items]        
Federal and State tax jurisdictions for tax period 2013      
Maximum [Member] | International Tax Jurisdictions [Member]
        
Income Taxes [Line Items]        
Federal and State tax jurisdictions for tax period 2013      
Minimum [Member]
        
Income Taxes [Line Items]        
Expire date of state investment tax credits 2015      
Minimum [Member] | Internal Revenue Service (IRS) [Member]
        
Income Taxes [Line Items]        
Federal and State tax jurisdictions for tax period 2011      
Minimum [Member] | Federal Tax Jurisdictions [Member]
        
Income Taxes [Line Items]        
Federal and State tax jurisdictions for tax period 2011      
Minimum [Member] | State Tax Jurisdictions [Member]
        
Income Taxes [Line Items]        
Federal and State tax jurisdictions for tax period 2009      
Minimum [Member] | International Tax Jurisdictions [Member]
        
Income Taxes [Line Items]        
Federal and State tax jurisdictions for tax period 2011