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Revenue - Summary of Revenue from Tenant Construction Projects Disaggregated by Tenant Agency (Detail) - ASU 2014-09 [Member]
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Disaggregation Of Revenue [Line Items]  
Tenant Construction Project Income $ 1,043
Administrative Office of the U.S. Courts ("AOC") [Member]  
Disaggregation Of Revenue [Line Items]  
Tenant Construction Project Income 100
Drug Enforcement Administration ("DEA") [Member]  
Disaggregation Of Revenue [Line Items]  
Tenant Construction Project Income 23
Federal Bureau of Investigation ("FBI") [Member]  
Disaggregation Of Revenue [Line Items]  
Tenant Construction Project Income 58
Immigration and Customs Enforcement ("ICE") [Member]  
Disaggregation Of Revenue [Line Items]  
Tenant Construction Project Income 9
National Park Service ("NPS") [Member]  
Disaggregation Of Revenue [Line Items]  
Tenant Construction Project Income 31
U.S. Coast Guard ("USCG") [Member]  
Disaggregation Of Revenue [Line Items]  
Tenant Construction Project Income 6
U.S. Forest Service ("USFS") [Member]  
Disaggregation Of Revenue [Line Items]  
Tenant Construction Project Income 29
Department of Veteran Affairs ("VA") [Member]  
Disaggregation Of Revenue [Line Items]  
Tenant Construction Project Income $ 787