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Estimated Amortization Expense for Intangibles Subject to Amortization (Detail) (USD $)
Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]  
October 1 to December 31, 2012 $ 542,000
2013 1,850,000
2014 1,179,000
2015 1,112,000
2016 569,000
2017 297,000
Thereafter 197,000
Customer relationships
 
Finite-Lived Intangible Assets [Line Items]  
October 1 to December 31, 2012 517,000
2013 1,750,000
2014 1,112,000
2015 1,112,000
2016 569,000
2017 297,000
Thereafter 197,000
Non-compete agreements
 
Finite-Lived Intangible Assets [Line Items]  
October 1 to December 31, 2012 25,000
2013 100,000
2014 $ 67,000