Segment Information - Schedule of Long Lived Assets Presented by Geographic Region (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Long-lived assets:
Long-lived assets	$ 28,653,811	$ 28,589,504	$ 26,495,743
United States [Member]
Long-lived assets:
Long-lived assets	21,035,992	20,582,055	18,228,939
China and All Other Foreign Countries [Member]
Long-lived assets:
Long-lived assets	$ 7,617,819	$ 8,007,449	$ 8,266,804

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Name:	us-gaap_NoncurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant