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Fair Value Disclosures - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
WRECO transaction [Member]
Assets And Liabilities Carrying Value And Fair Value [Line Items]          
Impairment charge of inventory recognized $ 552,000 $ 549,000 $ 1,124,000 $ 1,245,000 $ 340,300,000
Write off of option deposits and pre-acquisition costs         $ 3,000,000