Employee Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plans [Member]
Components of Net Periodic Benefit Cost (Credit):
Service cost	$ 1,235	$ 1,530	$ 971
Interest cost	19,871	24,600	30,041
Expected return on plan assets	(27,337)	(28,301)	(32,607)
Amortization of:
Prior service cost	2,369	2,376	2,841
Net actuarial loss (gain)	3,888	5,440	4,360
Net periodic benefit cost (credit)	26	5,645	5,606
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
Net actuarial (gain) loss	51,626	(4,650)	41,082
Reclassification of prior service (cost) credit to earnings	(2,369)	(2,376)	(2,841)
Reclassification of actuarial gain (loss) to earnings	(3,888)	(5,440)	(4,360)
Currency translation and other adjustments	(20,309)	(11,582)	(10,485)
Total recognized in AOCI	25,060	(24,048)	23,396
Net amount recognized in total periodic benefit cost and AOCI	25,086	(18,403)	29,002
Medical Plan [Member]
Components of Net Periodic Benefit Cost (Credit):
Service cost	11	27	33
Interest cost	167	179	194
Amortization of:
Net actuarial loss (gain)	(185)		(529)
Settlement gain	(1,788)
Net periodic benefit cost (credit)	(1,795)	206	(302)
Employer contributions	3,289	276	221
Benefits paid	3,289	276	221
Net actuarial (gain) loss	(1,638)	(695)	428
Reclassification of actuarial gain (loss) to earnings	1,973		529
Total recognized in AOCI	335	(695)	957
Net amount recognized in total periodic benefit cost and AOCI	$ (1,460)	$ (489)	$ 655