Employee Benefit Plans - Summary of Changes in Benefit Obligations, Fair Value of Assets, Funded Status and Amounts Recognized in Consolidated Statements of Financial Condition (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in benefit obligation
Benefit obligation at beginning of year	$ 655,015
Benefit obligation at end of year	744,705	$ 655,015
Change in plan assets
Fair value of plan assets at beginning of year	642,837
Fair value of plan assets at end of year	710,592	642,837
Pension Plans [Member]
Change in benefit obligation
Benefit obligation at beginning of year	655,015	763,831
Service cost	815	884	$ 1,413
Interest cost	15,350	15,569	16,240
Amendments	0	3,196
Actuarial (gain) loss	89,242	(27,623)
Benefits paid	(30,817)	(64,747)
Foreign currency translation and other adjustments	15,100	(36,095)
Benefit obligation at end of year	744,705	655,015	763,831
Change in plan assets
Fair value of plan assets at beginning of year	642,837	728,281
Actual return on plan assets	74,844	(10,608)	43,624
Employer contributions	5,623	22,153	16,844
Benefits paid	(30,760)	(62,056)	(42,022)
Foreign currency translation and other adjustments	18,048	(34,933)
Fair value of plan assets at end of year	710,592	642,837	$ 728,281
Funded (deficit) at end of year	(34,113)	(12,178)
Prepaid pension asset (included in “other assets”)	2,922	19,573
Accrued benefit liability (included in “other liabilities”)	(37,035)	(31,751)
Net amount recognized	(34,113)	(12,178)
Actuarial net loss (gain)	211,197	173,732
Prior service cost (credit)	3,165	3,178
Net amount recognized	$ 214,362	$ 176,910