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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Discounted Cash Flows Approach
Oct. 01, 2013
Discounted Cash Flows Approach
Fair Value, Observable inputs, Level 2
Minimum
Oct. 01, 2013
Discounted Cash Flows Approach
Fair Value, Observable inputs, Level 2
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% 3.50%
Decrease in carrying value of trade name       $ 1,100,000    
Amortization expenses $ 2,693,000 $ 1,618,000 $ 800,000