Pension and Postretirement Benefits - Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 5,293	$ 5,425	$ 10,552	$ 10,807
Expected return on plan assets	(5,001)	(6,677)	(10,004)	(13,354)
Net periodic (benefit) cost	292	(1,252)	548	(2,547)
TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	338	406	676	813
Expected return on plan assets	(397)	(710)	(794)	(1,420)
Net periodic (benefit) cost	$ (59)	$ (304)	$ (118)	$ (607)