Lease Intangible Assets and Liabilities - Summary of Lease Intangible Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Below Market Lease Net [Abstract]
Gross Liability	$ 19,658	$ 20,011
Accumulated Amortization	(5,182)	(3,184)
Balance	$ 14,476	$ 16,827

Amount of accumulated amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life.

No definition available.

Name:	us-gaap_BelowMarketLeaseAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant