Net Loss Per Share (Detail) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Jul. 05, 2019	Dec. 31, 2019 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares		Dec. 31, 2018 USD ($) $ / shares shares		Dec. 31, 2017 USD ($) $ / shares shares
Earnings Per Share [Abstract]
LendingClub net loss | $		$ 234	$ (383)	$ (10,661)	$ (19,935)	$ (13,462)	$ (22,804)	$ (60,861)	$ (31,181)	$ (30,745)		$ (128,308)		$ (153,835)
Weighted-average common shares - Basic (shares) | shares		88,371,672	87,588,495	86,719,049	86,108,871	85,539,436	84,871,828	84,238,897	83,659,860	87,278,596	[1]	84,583,461	[1]	81,799,189	[1]
Weighted-average common shares - Diluted (shares) | shares		88,912,677	87,588,495	86,719,049	86,108,871	85,539,436	84,871,828	84,238,897	83,659,860	87,278,596	[1]	84,583,461	[1]	81,799,189	[1]
Net loss per share attributable to LendingClub:
Basic ($ per share) | $ / shares		$ 0.00	$ 0.00	$ (0.12)	$ (0.23)	$ (0.16)	$ (0.27)	$ (0.72)	$ (0.37)	$ (0.35)	[1]	$ (1.52)	[1]	$ (1.88)	[1]
Diluted ($ per share) | $ / shares		$ 0.00	$ 0.00	$ (0.12)	$ (0.23)	$ (0.16)	$ (0.27)	$ (0.72)	$ (0.37)	$ (0.35)	[1]	$ (1.52)	[1]	$ (1.88)	[1]
1-for-5 stock split ratio	0.2

[1] All share and per share information has been retroactively adjusted to reflect a reverse stock split. See “Notes to Consolidated Financial Statements – Note 4. Net Loss Per Share” for additional information.