Organization and Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Gain or loss recorded upon consolidation	$ 0
MBS initial fixed interest rate required, period	one to ten years
Building Estimated Value	27 years 6 months
Building Salvage Value	$ 0
Unrecognized tax benefits	0
Unrecognized tax benefits, accrued interest or penalties	$ 0
Options to purchase common stock not included in the computation of diluted EPS	0	5,000
Potential effect of dilutive securities on average shares outstanding	4,535,000	4,244,000
Description of management fee	In exchange for services provided, our Manager receives a management fee, paid monthly in arrears, in an amount equal to one-twelfth of 1.20% of our Equity (as defined in the Management Agreement).
Monthly management fee payment in arrears, one-twelfth of percentage of equity	1.20%
Minimum
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
MBS initial fixed interest rate required, period	1 year
Maximum
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
MBS initial fixed interest rate required, period	10 years