Commitments and Contingencies - Additional Information (Detail) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2017
USD ($)
lease
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
|
| Commitments and Contingencies Disclosure [Abstract] | |||
| Number of ground leases | lease | 4 | ||
| Expenses incurred for the properties listed | $ 0.5 | $ 0.5 | $ 0.4 |
| Letters of credit, outstanding | $ 1.0 | ||
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. No definition available.
|
| X | ||||||||||
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
|
| X | ||||||||||
- Definition Number of separate real estate development properties located on land subject to ground leases. No definition available.
|