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, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in benefit obligation
Benefit obligation at beginning of year	$ 694,187
Benefit obligation at end of year	718,821	$ 694,187
Change in plan assets
Fair value of plan assets at beginning of year	656,084
Fair value of plan assets at end of year	646,119	656,084
Pension Plans [Member]
Change in benefit obligation
Benefit obligation at beginning of year	694,187	764,169
Service cost	1,235	1,530	$ 971
Interest cost	19,871	24,600	30,041
Actuarial (gain) loss	135,164	(22,395)
Benefits paid	(31,904)	(33,253)
Foreign currency translation and other adjustments	(99,732)	(40,464)
Benefit obligation at end of year	718,821	694,187	764,169
Change in plan assets
Fair value of plan assets at beginning of year	656,084	672,576
Actual return on plan assets	119,287	9,873	91,829
Employer contributions	11,343	39,301	7,648
Benefits paid	(29,384)	(32,321)	(28,877)
Foreign currency translation and other adjustments	(111,211)	(33,345)
Fair value of plan assets at end of year	646,119	656,084	672,576
Funded (deficit) at end of year	(72,702)	(38,103)
Prepaid pension asset (included in “other assets”)	822	20,785
Accrued benefit liability (included in “other liabilities”)	(73,524)	(58,888)
Net amount recognized	(72,702)	(38,103)
Actuarial net loss (gain)	192,855	165,462
Prior service cost	30	2,362
Net amount recognized	192,885	167,824
Medical Plan [Member]
Change in benefit obligation
Benefit obligation at beginning of year	4,750	5,514
Service cost	11	27	33
Interest cost	167	179	194
Actuarial (gain) loss	(1,639)	(694)
Benefits paid	(3,289)	(276)
Benefit obligation at end of year		4,750	5,514
Change in plan assets
Employer contributions	3,289	276	221
Benefits paid	$ (3,289)	(276)	$ (221)
Funded (deficit) at end of year		(4,750)
Accrued benefit liability (included in “other liabilities”)		(4,750)
Net amount recognized		(4,750)
Actuarial net loss (gain)		(335)
Net amount recognized		$ (335)