Other Assets and Liabilities - Summary of Unfunded Loan Commitement (Detail) - USD ($)		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2020
Current Expected Credit Loss Reserve	$ 112,694,000	$ 112,694,000
Increase in CECL reserve		122,702,000
Current Expected Credit Loss Reserve		112,694,000
Unfunded Loan Commitment [Member]
Increase in CECL reserve	19.3	19,273,000
Current Expected Credit Loss Reserve		22,536,000
Accounting Standards Update 2016-13 [Member]
Current Expected Credit Loss Reserve		17,650,000
Accounting Standards Update 2016-13 [Member] | Unfunded Loan Commitment [Member]
Current Expected Credit Loss Reserve	3,263,000	3,263,000
Increase in CECL reserve		22.5
Current Expected Credit Loss Reserve		3,263,000
U.S. Loans [Member] | Unfunded Loan Commitment [Member]
Increase in CECL reserve		16,992,000
Current Expected Credit Loss Reserve		19,793,000
U.S. Loans [Member] | Accounting Standards Update 2016-13 [Member]
Current Expected Credit Loss Reserve		8,955,000
U.S. Loans [Member] | Accounting Standards Update 2016-13 [Member] | Unfunded Loan Commitment [Member]
Current Expected Credit Loss Reserve	2,801,000	2,801,000
Non-US Loans [Member] | Unfunded Loan Commitment [Member]
Increase in CECL reserve		2,219,000
Current Expected Credit Loss Reserve		2,672,000
Non-US Loans [Member] | Accounting Standards Update 2016-13 [Member]
Current Expected Credit Loss Reserve		3,631,000
Non-US Loans [Member] | Accounting Standards Update 2016-13 [Member] | Unfunded Loan Commitment [Member]
Current Expected Credit Loss Reserve	453,000	453,000
Non-Standard Loans [Member] | Unfunded Loan Commitment [Member]
Increase in CECL reserve		62,000
Current Expected Credit Loss Reserve		71,000
Non-Standard Loans [Member] | Accounting Standards Update 2016-13 [Member]
Current Expected Credit Loss Reserve	0	0
Current Expected Credit Loss Reserve		1,356,000
Non-Standard Loans [Member] | Accounting Standards Update 2016-13 [Member] | Unfunded Loan Commitment [Member]
Current Expected Credit Loss Reserve	$ 9,000	$ 9,000