Employee Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plans [Member]
Components of Net Periodic Benefit Cost (Credit):
Service cost	$ 1,530	$ 971	$ 940
Interest cost	24,600	30,041	27,219
Expected return on plan assets	(28,301)	(32,607)	(27,078)
Amortization of:
Prior service cost	2,376	2,841	2,843
Net actuarial loss (gain)	5,440	4,360	3,691
Net periodic benefit cost (credit)	5,645	5,606	7,615
Actual return on plan assets	9,873	91,829	41,353
Employer contributions	39,301	7,648	2,274
Benefits paid	32,321	28,877	23,258
Net actuarial (gain) loss	(4,650)	41,082	17,251
Reclassification of prior service (cost) credit to earnings	(2,376)	(2,841)	(2,843)
Reclassification of actuarial gain (loss) to earnings	(5,440)	(4,360)	(3,691)
Currency translation and other adjustments	(11,582)	(10,485)	3,284
Total recognized in AOCI	(24,048)	23,396	14,001
Net amount recognized in total periodic benefit cost and AOCI	(18,403)	29,002	21,616
Medical Plan [Member]
Components of Net Periodic Benefit Cost (Credit):
Service cost	27	33	53
Interest cost	179	194	182
Amortization of:
Net actuarial loss (gain)		(529)
Net periodic benefit cost (credit)	206	(302)	235
Employer contributions	276	221	176
Benefits paid	276	221	176
Net actuarial (gain) loss	(695)	428	(647)
Reclassification of actuarial gain (loss) to earnings		529
Total recognized in AOCI	(695)	957	(647)
Net amount recognized in total periodic benefit cost and AOCI	$ (489)	$ 655	$ (412)