Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) |
9 Months Ended | |||
---|---|---|---|---|
Feb. 21, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Dec. 31, 2016 |
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Hedges or derivatives | $ 0 | $ 0 | ||
Earn-out payment | $ 2,400,000 | $ 3,778,000 | ||
Fair Value, Inputs, Level 3 [Member] | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Mortgage loans payable, fair value | $ 419,300,000 | $ 323,700,000 |