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Financial Instruments - Additional Information (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
Derivative
Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]    
Unrealized gain of hedging instrument $ 500,000  
Approximate fair value of notes 95,700,000 148,200,000
Carrying amount of notes 92,900,000 145,500,000
Tax Increment Financing Bonds ("TIF Bonds") 3,809,000 5,086,000
Aggregate notional amount 530,400,000 631,400,000
Number of interest rate derivatives held 9  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (5,900,000)