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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Discounted Cash Flows Approach
Oct. 01, 2012
Discounted Cash Flows Approach
Minimum
Oct. 01, 2012
Discounted Cash Flows Approach
Maximum
Schedule of Intangible Assets Disclosure [Line Items]            
Indefinite-lived intangible assets impairment, discount rate         12.50% 14.00%
Indefinite-lived intangible assets impairment, growth rate         2.00% 4.00%
Decrease in carrying value of trade name       $ 1,100,000    
Goodwill impairment loss 0          
Amortization expenses $ 1,618,000 $ 773,000 $ 700,000