Debt (Parenthetical) (Detail) - Mortgages debt and other	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Average interest rate	8.80%	8.80%
Debt instrument maturity period	2024-02

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Period Type:	duration