Pension Plans - Net Periodic Benefit (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 5,403	$ 6,743	$ 16,210	$ 20,230
Expected return on plan assets	(6,676)	(6,875)	(20,030)	(20,626)
Net periodic benefit	(1,273)	(132)	(3,820)	(396)
TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	407	475	1,220	1,425
Expected return on plan assets	(710)	(741)	(2,130)	(2,221)
Net periodic benefit	$ (303)	$ (266)	$ (910)	$ (796)