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, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in benefit obligation
Benefit obligation at beginning of year	$ 763,831
Benefit obligation at end of year	655,015	$ 763,831
Change in plan assets
Fair value of plan assets at beginning of year	728,281
Fair value of plan assets at end of year	642,837	728,281
Pension Plans [Member]
Change in benefit obligation
Benefit obligation at beginning of year	763,831	718,821
Service cost	884	1,413	$ 1,235
Interest cost	15,569	16,240	19,871
Amendments	3,196
Actuarial (gain) loss	(27,623)	2,702
Benefits paid	(64,747)	(44,589)
Foreign currency translation and other adjustments	(36,095)	69,244
Benefit obligation at end of year	655,015	763,831	718,821
Change in plan assets
Fair value of plan assets at beginning of year	728,281	646,119
Actual return on plan assets	(10,608)	43,624	119,287
Employer contributions	22,153	16,844	11,343
Benefits paid	(62,056)	(42,022)	(29,384)
Foreign currency translation and other adjustments	(34,933)	63,716
Fair value of plan assets at end of year	642,837	728,281	$ 646,119
Funded (deficit) at end of year	(12,178)	(35,550)
Prepaid pension asset (included in “other assets”)	19,573	16,189
Accrued benefit liability (included in “other liabilities”)	(31,751)	(51,739)
Net amount recognized	(12,178)	(35,550)
Actuarial net loss (gain)	173,732	184,135
Prior service cost (credit)	3,178
Net amount recognized	$ 176,910	$ 184,135