Real Estate Investments - Schedule of Finite-Lived Intangible Assets (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items]
Total acquired intangible assets, Gross Carrying Amount	$ 132,348
Below-market leases	75,484
Total market lease intangibles, Gross Carrying Amount	93,452
Total acquired intangible assets, Accumulated Amortization	42,431
Below-market leases	26,864
Total market lease intangibles, Accumulated Amortization	28,265
Total acquired intangible assets, Net Carrying Amount	89,917
Below-market leases	48,620
Total market lease intangibles, Net Carrying Amount	65,187
In-place Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Total acquired intangible assets, Gross Carrying Amount	108,253
Total acquired intangible assets, Accumulated Amortization	36,645
Total acquired intangible assets, Net Carrying Amount	71,608
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Total acquired intangible assets, Gross Carrying Amount	3,804
Total acquired intangible assets, Accumulated Amortization	750
Total acquired intangible assets, Net Carrying Amount	3,054
Above-market ground Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Total acquired intangible assets, Gross Carrying Amount	20,291
Total acquired intangible assets, Accumulated Amortization	5,036
Total acquired intangible assets, Net Carrying Amount	15,255
Above-market Ground Lease Liability [Member]
Finite-Lived Intangible Assets [Line Items]
Total market lease intangibles, Gross Carrying Amount	17,968
Total market lease intangibles, Accumulated Amortization	1,401
Total market lease intangibles, Net Carrying Amount	$ 16,567