Schedule III-Residential Real Estate (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Schedule III-Residential Real Estate
Encumbrances	$ 1,377,386
Initial Cost to Company
Land	430,460
Depreciable Property	1,537,957
Costs Capitalized Subsequent to Acquisition
Land	0
Depreciable Property	17,868
Gross Amounts Carried
Land	430,489
Depreciable Property	1,555,796
Total	1,986,285	$ 928,060	$ 40,497	$ 754,981
Accumulated Depreciation	(41,565)	$ (8,835)	$ (643)	$ (5,767)
Aggregate cost for federal income tax purposes	2,200,000
Office - Dublin, Ireland - 1
Schedule III-Residential Real Estate
Encumbrances	75,859
Initial Cost to Company
Land	34,356
Depreciable Property	67,115
Gross Amounts Carried
Land	34,356
Depreciable Property	67,115
Total	101,471
Accumulated Depreciation	$ (3,217)
Office - U.S., North East
Schedule III-Residential Real Estate
Number of properties | property	7
Encumbrances	$ 157,492
Initial Cost to Company
Land	11,283
Depreciable Property	181,744
Gross Amounts Carried
Land	11,283
Depreciable Property	181,744
Total	193,027
Accumulated Depreciation	$ (45)
Office - U.S., West
Schedule III-Residential Real Estate
Number of properties | property	6
Encumbrances	$ 72,874
Initial Cost to Company
Land	13,422
Depreciable Property	107,852
Gross Amounts Carried
Land	13,422
Depreciable Property	107,852
Total	121,274
Accumulated Depreciation	$ (35)
Office - U.S., South East
Schedule III-Residential Real Estate
Number of properties | property	9
Encumbrances	$ 104,797
Initial Cost to Company
Land	29,771
Depreciable Property	151,980
Costs Capitalized Subsequent to Acquisition
Depreciable Property	372
Gross Amounts Carried
Land	29,771
Depreciable Property	152,352
Total	182,123
Accumulated Depreciation	$ (1,165)
Office - U.S., Midwest
Schedule III-Residential Real Estate
Number of properties | property	7
Encumbrances	$ 69,715
Initial Cost to Company
Land	3,237
Depreciable Property	99,648
Gross Amounts Carried
Land	3,237
Depreciable Property	99,648
Total	102,885
Accumulated Depreciation	$ (27)
Office - U.S., South West
Schedule III-Residential Real Estate
Number of properties | property	8
Encumbrances	$ 104,194
Initial Cost to Company
Land	16,888
Depreciable Property	127,060
Gross Amounts Carried
Land	16,888
Depreciable Property	127,060
Total	143,948
Accumulated Depreciation	$ (38)
Office - Ireland
Schedule III-Residential Real Estate
Number of properties | property	11
Encumbrances	$ 222,681
Initial Cost to Company
Land	110,372
Depreciable Property	194,408
Costs Capitalized Subsequent to Acquisition
Depreciable Property	399
Gross Amounts Carried
Land	110,372
Depreciable Property	194,807
Total	305,179
Accumulated Depreciation	$ (10,679)
Multi-family - U.S., South East
Schedule III-Residential Real Estate
Number of properties | property	40
Encumbrances	$ 446,762
Initial Cost to Company
Land	150,436
Depreciable Property	480,261
Costs Capitalized Subsequent to Acquisition
Depreciable Property	13,062
Gross Amounts Carried
Land	150,465
Depreciable Property	493,294
Total	643,759
Accumulated Depreciation	$ (20,690)
Multi-family - U.S., South West
Schedule III-Residential Real Estate
Number of properties | property	1
Initial Cost to Company
Land	$ 665
Depreciable Property	2,413
Gross Amounts Carried
Land	665
Depreciable Property	2,413
Total	3,078
Accumulated Depreciation	$ (192)
Multi-family - Ireland
Schedule III-Residential Real Estate
Number of properties | property	1
Encumbrances	$ 10,705
Initial Cost to Company
Land	7,987
Depreciable Property	8,489
Gross Amounts Carried
Land	7,987
Depreciable Property	8,489
Total	16,476
Accumulated Depreciation	$ (466)
Retail - U.S., North East
Schedule III-Residential Real Estate
Number of properties | property	3
Encumbrances	$ 22,780
Initial Cost to Company
Land	7,457
Depreciable Property	24,804
Costs Capitalized Subsequent to Acquisition
Depreciable Property	869
Gross Amounts Carried
Land	7,457
Depreciable Property	25,673
Total	33,130
Accumulated Depreciation	$ (992)
Retail - U.S., West
Schedule III-Residential Real Estate
Number of properties | property	2
Initial Cost to Company
Land	$ 1,339
Depreciable Property	2,911
Costs Capitalized Subsequent to Acquisition
Depreciable Property	528
Gross Amounts Carried
Land	1,339
Depreciable Property	3,439
Total	4,778
Accumulated Depreciation	$ (106)
Retail - U.S., South East
Schedule III-Residential Real Estate
Number of properties | property	3
Encumbrances	$ 11,353
Initial Cost to Company
Land	7,368
Depreciable Property	9,303
Costs Capitalized Subsequent to Acquisition
Depreciable Property	385
Gross Amounts Carried
Land	7,368
Depreciable Property	9,688
Total	17,056
Accumulated Depreciation	$ (461)
Retail - U.S., Midwest
Schedule III-Residential Real Estate
Number of properties | property	2
Encumbrances	$ 12,300
Initial Cost to Company
Land	7,655
Depreciable Property	10,523
Costs Capitalized Subsequent to Acquisition
Depreciable Property	937
Gross Amounts Carried
Land	7,655
Depreciable Property	11,460
Total	19,115
Accumulated Depreciation	$ (452)
Retail - U.S., South West
Schedule III-Residential Real Estate
Number of properties | property	3
Encumbrances	$ 31,807
Initial Cost to Company
Land	10,108
Depreciable Property	26,620
Costs Capitalized Subsequent to Acquisition
Depreciable Property	294
Gross Amounts Carried
Land	10,108
Depreciable Property	26,914
Total	37,022
Accumulated Depreciation	$ (1,654)
Retail - U.S., Mid Atlantic
Schedule III-Residential Real Estate
Number of properties | property	2
Encumbrances	$ 10,600
Initial Cost to Company
Land	12,675
Depreciable Property	10,830
Costs Capitalized Subsequent to Acquisition
Depreciable Property	193
Gross Amounts Carried
Land	12,675
Depreciable Property	11,023
Total	23,698
Accumulated Depreciation	$ (283)
Industrial - U.S., Midwest
Schedule III-Residential Real Estate
Number of properties | property	1
Initial Cost to Company
Land	$ 717
Depreciable Property	2,603
Costs Capitalized Subsequent to Acquisition
Depreciable Property	272
Gross Amounts Carried
Land	717
Depreciable Property	2,875
Total	3,592
Accumulated Depreciation	$ (248)
Self-storage - U.S., North East
Schedule III-Residential Real Estate
Number of properties | property	1
Encumbrances	$ 9,800
Initial Cost to Company
Land	2,202
Depreciable Property	11,498
Costs Capitalized Subsequent to Acquisition
Depreciable Property	67
Gross Amounts Carried
Land	2,202
Depreciable Property	11,565
Total	13,767
Accumulated Depreciation	$ (337)
Mixed Use - U.S., West
Schedule III-Residential Real Estate
Number of properties | property	1
Encumbrances	$ 8,667
Initial Cost to Company
Land	1,002
Depreciable Property	14,323
Costs Capitalized Subsequent to Acquisition
Depreciable Property	6
Gross Amounts Carried
Land	1,002
Depreciable Property	14,329
Total	15,331
Accumulated Depreciation	$ (361)
Mixed Use - U.S., South East
Schedule III-Residential Real Estate
Number of properties | property	1
Encumbrances	$ 5,000
Initial Cost to Company
Land	1,520
Depreciable Property	3,572
Costs Capitalized Subsequent to Acquisition
Depreciable Property	484
Gross Amounts Carried
Land	1,520
Depreciable Property	4,056
Total	5,576
Accumulated Depreciation	$ (117)