Equity - 2013 Incentive Award Plan (Detail) - shares	9 Months Ended
	Sep. 30, 2020	Jun. 11, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Performance Unit Distribution Sharing Percentage	10.00%
Amended and Restated 2013 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares that may be issued (in shares)		1,770,000
Common stock, shares reserved for future issuance	1,120,689