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Contingencies - Additional Information (Detail) (USD $)
 3 Months Ended 1 Months Ended
Sep. 30, 2013
Oct. 25, 2013
Subsequent Events [Member]
Loss Contingencies [Line Items]    
Minimum estimated range of aggregate loss for legal proceedings $ 0  
Maximum estimated range of aggregate loss for legal proceedings 24,000,000  
Agreed settlement amount   10,000,000
Amount of recovered insurance proceeds   4,900,000
Net amount due under the settlement agreement   5,100,000
Agreed full and final settlement amount   500,000
Litigation expenses $ 2,300,000