Pension Plans - Net Periodic Benefit Gain (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 5,425	$ 6,709	$ 10,807	$ 13,487
Expected return on plan assets	(6,677)	(6,876)	(13,354)	(13,751)
Recognized net actuarial loss and other		217
Net periodic (benefit) cost	(1,252)	50	(2,547)	(264)
TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	406	475	813	950
Expected return on plan assets	(710)	(740)	(1,420)	(1,480)
Net periodic (benefit) cost	$ (304)	$ (265)	$ (607)	$ (530)