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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]      
Deferred tax assets related to acquisitions of non controlling interests $ 400,000 $ 800,000  
Tax receivable included in other current assets 2,200,000 4,200,000  
Increase in current state income tax provision 393,000    
Adjustment to state tax provision   162,000  
Accrued interest and penalties associated with any unrecognized tax benefits 0 0 0
Interest expense recognized $ 0 $ 0 $ 0
State [Member]
      
Income Taxes [Line Items]      
Periods open for examination 2009 through 2012    
Federal [Member]
      
Income Taxes [Line Items]      
Periods open for examination 2010 through 2012