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Commitments and Contingencies - Additional Information (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
2013 marketing commitments
Jun. 30, 2013
Minimum
Jun. 30, 2013
Maximum
Commitment And Contingencies [Line Items]          
Marketing commitments to be spent     $ 1,700,000    
Marketing commitments spending period     2 years    
Insurance reserves 6,500,000 6,600,000      
Insurance reserves classified as current accrued liabilities and other 858,000 871,000      
Estimate of the amount of probable loss       $ 5,000,000 $ 12,900,000