Pension and Postretirement Benefits - Net Periodic Cost (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 5,276	$ 5,403	$ 15,828	$ 16,210
Expected return on plan assets	(5,002)	(6,676)	(15,006)	(20,030)
Net periodic cost (benefit)	274	(1,273)	822	(3,820)
TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	338	407	1,014	1,220
Expected return on plan assets	(397)	(710)	(1,191)	(2,130)
Net periodic cost (benefit)	$ (59)	$ (303)	$ (177)	$ (910)