Other assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure Abstract
Net deferred tax assets (net of valuation allowance)	$ 677,053	$ 851,592
Investments under the equity method	288,259	250,467
Prepaid taxes	45,519	32,615
Other prepaid expenses	85,255	74,572
Derivative assets	23,827	20,785
Trades receivables from brokers and counterparties	75,589	65,429
Principal, interest and escrow servicing advances	59,109	65,671
Guaranteed mortgage loan claims receivable	96,212	80,477
Operating ROU assets	139,632	131,921
Finance ROU assets	13,933	15,464
Others	130,451	148,048
Total other assets	$ 1,634,839	$ 1,737,041