The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

No definition available.

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The Company - Additional Information (Detail) - IRT - USD ($) $ in Thousands	Oct. 05, 2016	Sep. 27, 2016
Nature Of Operations [Line Items]
Purchase price to be paid by IRT		$ 43,000
Common Shares
Nature Of Operations [Line Items]
Number of shares sold to IRT	7,269,719