Pension and Postretirement Benefits - Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 21,613	$ 26,972	$ 23,996
Expected return on plan assets	(26,707)	(27,501)	(38,306)
Actuarial loss (gain)	26,842	(8,728)	22,002
Net periodic benefit cost (gain)	$ 21,748	$ (9,257)	$ 7,692
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate	4.00%	4.80%	4.00%
Expected return on plan assets	5.00%	5.00%	6.50%
TCN Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,626	$ 1,900	$ 1,867
Expected return on plan assets	(2,840)	(2,961)	(2,602)
Actuarial loss (gain)	(657)	6,027	(10,822)
Net periodic benefit cost (gain)	$ (1,871)	$ 4,966	$ (11,557)
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate	4.00%	4.80%	4.00%
Expected return on plan assets	6.90%	6.90%	6.90%