Leases - Summary of Termination and Redevelopement Properties (Detail) - ft²	Mar. 12, 2019	Jun. 30, 2019
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area		35,100,000
Antioch, CA [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	95,200
Notice	2018-08
Termination	2018-12
Columbus, MS [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	117,100
Notice	2018-08
Termination	2018-12
Dayton, OH [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	148,800
Notice	2018-08
Termination	2018-12
Announced Redevelopment	Q2 2017
Flagstaff, AZ [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	66,200
Notice	2018-08
Termination	2018-12
Ft. Wayne, IN [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	213,600
Notice	2018-08
Termination	2018-12
Announced Redevelopment	Q3 2016 / Q3 2017 / Q2 2019
Jackson, MI [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	144,200
Notice	2018-08
Termination	2018-12
Manchester, NH [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	135,100
Notice	2018-08
Termination	2018-12
Announced Redevelopment	Q4 2018
Salem, NH [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	119,000
Notice	2018-08
Termination	2018-12
Announced Redevelopment	Q4 2017
Savannah, GA [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	155,700
Notice	2018-08
Termination	2018-12
Scott Depot, WV [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	89,800
Notice	2018-08
Termination	2018-12
Announced Redevelopment	Sold
Steger, IL [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	87,400
Notice	2018-08
Termination	2018-12
Victor, NY [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	115,300
Notice	2018-08
Termination	2018-12
Announced Redevelopment	Q2 2019
West Jordan, UT [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	117,300
Notice	2018-08
Termination	2018-12
Announced Redevelopment	Q3 2016 / Q3 2018
Chesapeake, VA [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	169,400
Notice	2018-06
Termination	2018-11
Clay, NY [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	138,000
Notice	2018-06
Termination	2018-11
Havre, MT [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	94,700
Notice	2018-06
Termination	2018-11
Announced Redevelopment	Sold
Newark, CA [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	145,800
Notice	2018-06
Termination	2018-11
Oklahoma City, OK [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	173,700
Notice	2018-06
Termination	2018-11
Announced Redevelopment	Q3 2017
Troy, MI [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	271,300
Notice	2018-06
Termination	2018-11
Announced Redevelopment	Q3 2016
Virginia Beach, VA [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	86,900
Notice	2018-06
Termination	2018-11
Announced Redevelopment	Q3 2015
Madison, WI [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	88,100
Notice	2018-06
Termination	2018-10
Announced Redevelopment	Q2 2016
Thousand Oaks, CA [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	50,300
Notice	2018-06
Termination	2018-10
Announced Redevelopment	Q3 2015
Cedar Rapids, IA [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	141,100
Notice	2018-04
Termination	2018-08
Citrus Heights, CA [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	280,700
Notice	2018-04
Termination	2018-08
Gainesville, FL [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	140,500
Notice	2018-04
Termination	2018-08
Announced Redevelopment	Q2 2018
Maplewood, MN [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	168,500
Notice	2018-04
Termination	2018-08
Pensacola, FL [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	212,300
Notice	2018-04
Termination	2018-08
Announced Redevelopment	Q2 2018
Rochester, NY [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	128,500
Notice	2018-04
Termination	2018-08
Roseville, CA [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	121,000
Notice	2018-04
Termination	2018-08
Announced Redevelopment	Q2 2017 / Q1 2018
San Antonio, TX [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	187,800
Notice	2018-04
Termination	2018-08
Announced Redevelopment	Q4 2015
Warrenton, VA [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	113,900
Notice	2018-04
Termination	2018-08
Announced Redevelopment	Q1 2018
Westwood, TX [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	215,000
Notice	2017-06
Termination	2018-01
Announced Redevelopment	Q3 2018
Friendswood, TX [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	166,000
Notice	2017-06
Termination	2017-11
Albany, NY [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	216,200
Notice	2017-06
Termination	2017-10
Announced Redevelopment	Q1 2016
Burnsville, MN [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	161,700
Notice	2017-06
Termination	2017-10
Chicago, IL (N Harlem) [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	293,700
Notice	2017-06
Termination	2017-10
Cockeysville, MD [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	83,900
Notice	2017-06
Termination	2017-10
Announced Redevelopment	Q1 2017
East Northport, NY [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	187,000
Notice	2017-06
Termination	2017-10
Announced Redevelopment	Q2 2017
Greendale, WI [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	238,400
Notice	2017-06
Termination	2017-10
Announced Redevelopment	Q4 2017
Hagerstown, MD [member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	107,300
Notice	2017-06
Termination	2017-10
Announced Redevelopment	Q1 2016 / Sold
Johnson City, NY [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	155,100
Notice	2017-06
Termination	2017-10
Announced Redevelopment	Sold
Lafayette, LA [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	194,900
Notice	2017-06
Termination	2017-10
Mentor, OH [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	208,700
Notice	2017-06
Termination	2017-10
Middleburg Heights, OH [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	351,600
Notice	2017-06
Termination	2017-10
Olean, NY [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	75,100
Notice	2017-06
Termination	2017-10
Announced Redevelopment	Q1 2017
Overland Park, KS [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	215,000
Notice	2017-06
Termination	2017-10
Roseville, MI [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	277,000
Notice	2017-06
Termination	2017-10
Announced Redevelopment	Q3 2016
Sarasota, FL [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	204,500
Notice	2017-06
Termination	2017-10
Toledo, OH [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	209,900
Notice	2017-06
Termination	2017-10
Warwick, RI [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	169,200
Notice	2017-06
Termination	2017-10
Announced Redevelopment	Q3 2016 / Q3 2017
York, PA [Member] | Lease Terminations [Member] | Master Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	82,000
Notice	2017-06
Termination	2017-10
Announced Redevelopment	Sold
Chapel Hill, OH [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	187,179
Notice	2017-01
Termination	2017-04
Concord, NC [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	137,499
Notice	2017-01
Termination	2017-04
Announced Redevelopment	Sold
Detroit Lakes, MN [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	79,102
Notice	2017-01
Termination	2017-04
El Paso, TX [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	103,657
Notice	2017-01
Termination	2017-04
Announced Redevelopment	Q2 2018
Elkins, WV [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	94,885
Notice	2017-01
Termination	2017-04
Announced Redevelopment	Sold
Henderson, NV [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	122,823
Notice	2017-01
Termination	2017-04
Announced Redevelopment	Q1 2017
Hopkinsville, KY [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	70,326
Notice	2017-01
Termination	2017-04
Announced Redevelopment	Q1 2018
Jefferson City, MO [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	92,016
Notice	2017-01
Termination	2017-04
Announced Redevelopment	Q2 2017
Kenton, OH [Member] | Lease Terminations [Member] | Master Lease [Member] | Sears Holdings Corporation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Gross leasable area	96,066
Notice	2017-01
Termination	2017-04