Income (Loss) per share - Schedule of earnings per share, basic and diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income (loss) attributable to Hyzon	$ (44,054)	$ (24,795)	$ (90,496)	$ 35,476	$ (134,550)	$ 10,681
Weighted average shares outstanding:
Basic (in shares)	244,885,000	248,164,000			244,686,000	248,054,000
Effect of dilutive securities (in shares)	0	0			0	9,774,000
Diluted (in shares)	244,885,000	248,164,000			244,686,000	257,828,000
Net income (loss) per share attributable to Hyzon:
Basic (dollars per share)	$ (0.18)	$ (0.10)			$ (0.55)	$ 0.04
Diluted (dollars per share)	$ (0.18)	$ (0.10)			$ (0.55)	$ 0.04