Subsequent Event (Details) - USD ($)		12 Months Ended
Feb. 12, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Performance period (in years)		3 years
Mandatory holding period upon vesting		4 years
Subsequent Event \| Outperformance Program 2019
Subsequent Event [Line Items]
Maximum bonus pool	$ 28,000,000.0
TSR, absolute hurdle rate	3.00%
TSR, absolute hurdle rate, percent of performance in excess of hurdle rate	7.00%
TSR, percent in excess of SNL US office REIT index	3.00%
TSR, Percent of underperformance under SNL US office REIT index	3.00%
TSR, Percent of underperformance under SNL US office REIT index, threshold	3.00%
Target bonus pool	$ 3,971,000
TSR, Maximum bonus pool, percent of simple annual TSR	8.00%
Performance period (in years)	3 years
Mandatory holding period upon vesting	2 years
Subsequent Event \| Outperformance Program 2019 \| Maximum
Subsequent Event [Line Items]
TSR, linear reduction in absolute TSR performance	100.00%
TSR, linear reduction in simple annual TSR performance	7.00%
Subsequent Event \| Outperformance Program 2019 \| Minimum
Subsequent Event [Line Items]
TSR, linear reduction in absolute TSR performance	25.00%
TSR, linear reduction in simple annual TSR performance	0.00%
Subsequent Event \| Outperformance Program 2019 \| Victor J. Coleman
Subsequent Event [Line Items]
TSR, award percentage	24.00%
Subsequent Event \| Outperformance Program 2019 \| Mark T. Lammas
Subsequent Event [Line Items]
TSR, award percentage	13.75%
Subsequent Event \| Outperformance Program 2019 \| Alex Vouvalides
Subsequent Event [Line Items]
TSR, award percentage	9.15%
Subsequent Event \| Outperformance Program 2019 \| Christopher Barton
Subsequent Event [Line Items]
TSR, award percentage	6.40%
Subsequent Event \| Outperformance Program 2019 \| Josh Hatfield
Subsequent Event [Line Items]
TSR, award percentage	6.40%

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Share-based Compensation Arrangement By Share-based Payment Award, Target Bonus Pool

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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