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Mortgage and Loans Payable - Mortgage Payable - Additional Information (Detail) - USD ($)		1 Months Ended		9 Months Ended
	Jul. 11, 2011	Jul. 31, 2013	May. 31, 2008	Sep. 30, 2015	Jul. 11, 2008
Debt Instrument [Line Items]
New maturity date of mortgage loan				Dec. 17, 2015
First Mortgage [Member]
Debt Instrument [Line Items]
Company's consolidated debt				$ 0
Mortgages Payable [Member]
Debt Instrument [Line Items]
Company's consolidated debt				$ 1,022,500	$ 2,580,000
Basis spread on variable rate	0.75%	0.75%
Maturity date			May 14, 2015	Jul. 11, 2013
Periodic payments, principal				$ 10,750
Interest rate description				Prime rate plus three-fourths of one percent (0.75%)
New maturity date of mortgage loan				Dec. 17, 2015
Periodic payment			$ 5,080
Interest rate, stated percentage			6.45%
Mortgages Payable [Member] | First Mortgage [Member]
Debt Instrument [Line Items]
Principal amount of loan, outstanding			$ 679,000

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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-Name Accounting Standards Codification



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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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