Guarantees and Indemnifications (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Guarantor Obligations [Line Items]
Guarantees and Indemnifications Outstanding Amount, Expires Within One Year	$ 170,528
Guarantees and Indemnifications Outstanding Amount, Expires After One Year	58,375
Guarantees and Indemnifications, Total Outstanding Amount	228,903
Guarantees and Indemnifications, Maximum Potential Amount of Future Payments	509,942
Financial stand-by letters of credit
Guarantor Obligations [Line Items]
Guarantees and Indemnifications Outstanding Amount, Expires Within One Year	164,776
Guarantees and Indemnifications Outstanding Amount, Expires After One Year	58,014
Guarantees and Indemnifications, Total Outstanding Amount	222,790
Guarantees and Indemnifications, Maximum Potential Amount of Future Payments	448,602
Performance stand-by letters of credit
Guarantor Obligations [Line Items]
Guarantees and Indemnifications Outstanding Amount, Expires Within One Year	3,351
Guarantees and Indemnifications, Total Outstanding Amount	3,351
Guarantees and Indemnifications, Maximum Potential Amount of Future Payments	3,351
Commercial Letters of Credit
Guarantor Obligations [Line Items]
Guarantees and Indemnifications Outstanding Amount, Expires Within One Year	2,401
Guarantees and Indemnifications Outstanding Amount, Expires After One Year	361
Guarantees and Indemnifications, Total Outstanding Amount	2,762
Guarantees and Indemnifications, Maximum Potential Amount of Future Payments	$ 57,989