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Debt - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Oct. 31, 2012
Debt Instrument [Line Items]      
Debt outstanding $ 0 $ 0  
Revolver [Member]
     
Debt Instrument [Line Items]      
Amount of revolving credit facility     10,000,000
Expiry period of revolver 3 years    
Revolving credit facility, interest rate description LIBOR + 2.00% per annum (for LIBOR loans) or the greater of 1.00% or the bank's prime rate minus 0.50% per annum (for base rate loans)    
Commitment fee 50,000    
Date of expiry Oct. 16, 2015    
Unused credit facility fee 0.25%    
Borrowings under Revolver $ 0 $ 0  
Revolver [Member] | Base Rate Loan [Member]
     
Debt Instrument [Line Items]      
Base rate loan 1.00%    
Rate of Base Rate Loans (0.50%)    
Revolver [Member] | LIBOR Loans [Member]
     
Debt Instrument [Line Items]      
Rate of Base Rate Loans 2.00%