Quarterly report pursuant to sections 13 or 15(d)

Goodwill and Intangible Assets - Additional Information (Detail)

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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]          
Goodwill accumulated impairment charges         $ 64,100,000
Amortization of intangible assets $ 648,000 $ 670,000 $ 1,972,000 $ 2,028,000