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Financial Instruments - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2012 Derivative | Dec. 31, 2011 | Dec. 31, 2012 Treasury locks [Member] | Dec. 31, 2012 Eight interest rate swaps entered in 2012 [Member] | Nov. 30, 2012 4.625% senior unsecured notes [Member] | Jun. 30, 2012 4.625% senior unsecured notes [Member]
Derivative [Line Items] |  |  |  |  |  |
Aggregate Notional Amount | $ 632,800,000 | $ 284,100,000 | $ 200,000,000 | $ 450,000,000 |  |
Principal amount of Senior Notes | 450,000,000 |  |  |  | 150,000,000 | 300,000,000
Payment to the counter party |  |  | 4,700,000 |  |  |
Unrealized loss of hedging instrument | 8,300,000 | 3,700,000 |  |  |  |
Approximate fair value of notes | 250,700,000 | 90,600,000 |  |  |  |
Carrying amount of notes | 250,400,000 | 91,000,000 |  |  |  |
Tax Increment Financing Bonds ("TIF Bonds") | 5,200,000 | 6,400,000 |  |  |  |
Derivative financial instruments | 17,100,000 | 8,800,000 |  |  |  |
Number of interest rate derivatives held | 10 |  |  |  |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | $ (7,300,000) |  |  |  |  |

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