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Fair Value of Financial Instruments - Carrying Amounts and Fair Values of Financial Instruments Measured based on Level Two Inputs (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Carrying Value    
Fair Value of Financial Instruments    
Indebtedness $ 522,394 $ 522,180
Interest rate swap liabilities 568 829
Interest rate cap assets 479 259
Fair Value | Level 2    
Fair Value of Financial Instruments    
Indebtedness 522,438 527,414
Interest rate swap liabilities 568 829
Interest rate cap assets $ 479 $ 259