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Debt - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2015
Jul. 10, 2015
Dec. 31, 2014
Subsequent Event | Unsecured Private Placement Loan      
Debt Instrument [Line Items]      
Unsecured private placement loan   $ 100,000,000  
Multi currency revolving credit agreement [Member]      
Debt Instrument [Line Items]      
Revolving credit agreement $ 125,000,000    
Credit agreement expiry Date Jul. 31, 2019    
Letters of Credit Outstanding $ 4,952,000    
Debt Outstanding 10,000,000    
Unused Revolving credit 110,048,000    
Unrestricted retained earnings $ 107,400,000   $ 88,684,000