Rendering

Component: (Network and Table)
Network
040510 - Disclosure - Mortgages Payable (Principal repayments for the next five years) (Details)
(http://www.alx-inc.com/role/MortgagesPayablePrincipalRepaymentsForTheNextFiveYearsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000003499 (http://www.sec.gov/CIK)
Mortgages Payable [Abstract]Period [Axis]
2016-12-31
Mortgages Payable [Abstract]
 
Net carrying value of real estate collaterizing the debt
663,274,000  
Repayments of Long-term Debt
 
2017
3,707,000  
2018
402,440,000  
2019
0  
2020
0  
2021
300,000,000  
Thereafter
350,000,000