Real Estate and Loans Receivable - Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Intangible lease assets	$ 296,176	$ 256,950
Intangible Assets [Member]
Debt Instrument [Line Items]
Intangible lease assets	296,200	257,000
Accumulated amortization, net	263,800	231,700
Amortization expense related to intangible lease assets	$ 13,400	$ 9,100	$ 7,000
Capitalized lease intangibles, weighted average life (in years)	22 years 1 month 6 days