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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]        
Goodwill accumulated impairment charges   $ 64,100,000   $ 64,100,000
Amortization of intangible assets $ 652,000 $ 674,000 $ 1,324,000 $ 1,358,000