v3.21.2
Stock-based Compensation - Summary Of Stock Option Activity (Parenthetical) (Detail) - Bird Rides [Member] - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated share based compensation $ 1,528 $ 1,208 $ 4,296 $ 4,754 $ 6,174 $ 30,738
General and Administrative Expense [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated share based compensation $ 1,259 $ 804 $ 3,352 $ 3,428 $ 4,372 $ 28,784
2017 Amended Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation by share based award early exercise of stock options         2.9 0.3
2017 Amended Equity Incentive Plan [Member] | Board Members [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation by share based award number of options fully vested during the period         4.8 7.2
2017 Amended Equity Incentive Plan [Member] | Board Members [Member] | General and Administrative Expense [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated share based compensation         $ 700 $ 24,100