Other assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure Abstract
Net deferred tax assets (net of valuation allowance)	$ 804,148	$ 851,592
Investments under the equity method	262,335	250,467
Prepaid taxes	26,464	32,615
Other prepaid expenses	78,864	74,572
Derivative assets	20,971	20,785
Trades receivables from brokers and counterparties	72,567	65,429
Principal, interest and escrow servicing advances	66,158	65,671
Guaranteed mortgage loan claims receivable	72,649	80,477
Operating ROU assets	127,622	131,921
Finance ROU assets	14,884	15,464
Others	166,421	148,048
Total other assets	$ 1,713,083	$ 1,737,041