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Financial Instruments - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Derivative
Sep. 30, 2012
Sep. 30, 2013
Derivative
Sep. 30, 2012
Dec. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]          
Change in fair value of interest-rate contracts $ (1,537,000) $ (3,988,000) $ 11,107,000 $ (14,995,000)  
Approximate fair value of notes 305,900,000   305,900,000   250,700,000
Carrying amount of notes 303,600,000   303,600,000   250,400,000
Tax Increment Financing Bonds ("TIF Bonds") 5,174,000   5,174,000   5,247,000
Aggregate notional amount 631,800,000   631,800,000   632,800,000
Number of interest rate derivatives held 10   10    
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ (6,700,000)   $ (6,700,000)