Annual report pursuant to Section 13 and 15(d)

Income Tax - Cash Dividends Paid for Federal Income Tax Purposes (Detail)

v3.8.0.1
Income Tax - Cash Dividends Paid for Federal Income Tax Purposes (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Common distributions    
Total 100.00% 100.00%
Ordinary Income [Member]    
Common distributions    
Cash dividend paid, Percent 15.00% 0.00%
Return Of Capital [Member]    
Common distributions    
Cash dividend paid, Percent 85.00% 100.00%