Pension and Postretirement Benefits - Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 5,259	$ 5,382
Expected return on plan assets	(5,003)	(6,677)
Net periodic (benefit) cost	256	(1,295)
TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	338	407
Expected return on plan assets	(397)	(710)
Net periodic (benefit) cost	$ (59)	$ (303)