Note Other assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure Abstract
Net deferred tax assets (net of valuation allowance)	$ 993,330	$ 1,049,895
Investments under the equity method	234,642	228,072
Prepaid taxes	27,082	33,842
Other prepaid expenses	87,315	82,742
Derivative assets	14,843	13,603
Trades receivables from brokers and counterparties	32,043	40,088
Principal, interest and escrow servicing advances	93,590	88,371
Guaranteed mortgage loan claims receivable	51,852	59,613
Operating ROU assets	132,538	0
Finance ROU assets	16,777	0
Others	115,716	117,908
Total other assets	$ 1,799,728	$ 1,714,134