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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 320,000 $ 186,000 $ 612,000 $ 321,000
Preferred Supplier Agreement [Member]
       
Finite-Lived Intangible Assets [Line Items]        
Contract related intangible asset     $ 2,100,000