Employee Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Plans [Member]
Components of Net Periodic Benefit Cost (Credit):
Service cost	$ 884	$ 1,413	$ 1,235
Interest cost	15,569	16,240	19,871
Expected return on plan assets	(29,622)	(25,300)	(27,337)
Amortization of:
Prior service cost	18	30	2,369
Net actuarial loss (gain)	11,840	10,141	3,888
Settlement loss (gain)	1,212	807
Net periodic benefit cost (credit)	(99)	3,331	26
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
Prior service cost (credit)	3,196
Net actuarial (gain) loss	11,073	(17,357)	51,626
Reclassification of prior service (cost) credit to earnings	(18)	(30)	(2,369)
Reclassification of actuarial gain (loss) to earnings	(13,052)	(10,141)	(3,888)
Currency translation and other adjustments	(8,424)	18,778	(20,309)
Total recognized in AOCI	(7,225)	(8,750)	25,060
Net amount recognized in total periodic benefit cost and AOCI	$ (7,324)	$ (5,419)	25,086
Medical Plan [Member]
Components of Net Periodic Benefit Cost (Credit):
Service cost			11
Interest cost			167
Amortization of:
Net actuarial loss (gain)			(185)
Settlement loss (gain)			(1,788)
Net periodic benefit cost (credit)			(1,795)
Employer contributions			3,289
Benefits paid			3,289
Net actuarial (gain) loss			(1,638)
Reclassification of actuarial gain (loss) to earnings			1,973
Total recognized in AOCI			335
Net amount recognized in total periodic benefit cost and AOCI			$ (1,460)