Investment Properties and Properties Held for Sale - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2014 State Tenants Property
Long Lived Assets Held-for-sale [Line Items]
Property leased to fully constructed fast-food restaurants	12
Location of properties	5
Number of tenants	11
Lease Expiration Date	May 31, 2014
Notice of Default Expiration Date	Feb. 23, 2014
Wendy's restaurants [Member]
Long Lived Assets Held-for-sale [Line Items]
Property leased to fully constructed fast-food restaurants	9
Applebee's restaurant [Member]
Long Lived Assets Held-for-sale [Line Items]
Property leased to fully constructed fast-food restaurants	1
KFC Restaurant [Member]
Long Lived Assets Held-for-sale [Line Items]
Property leased to fully constructed fast-food restaurants	1
Vacant Property [Member]
Long Lived Assets Held-for-sale [Line Items]
Property leased to fully constructed fast-food restaurants	1