Pension and Postretirement Benefits other than Pensions - Net Periodic Benefit Cost of Defined Benefit Plans and Other Postretirement Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
U.S. Pension Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 232	$ 213
Interest cost	3,084	3,370
Expected return on plan assets	(4,421)	(4,764)
Amortization of prior service cost (credit) and recognized actuarial loss (gain)	276	16
Other	0	0
Net periodic benefit cost (income)	(829)	(1,165)
Non-U.S. Pension Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	889	861
Interest cost	1,295	1,802
Expected return on plan assets	(860)	(958)
Amortization of prior service cost (credit) and recognized actuarial loss (gain)	679	231
Other	120	0
Net periodic benefit cost (income)	2,123	1,936
U.S. Other Postretirement Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	109	106
Interest cost	353	397
Amortization of prior service cost (credit) and recognized actuarial loss (gain)	(396)	(481)
Other	6	6
Net periodic benefit cost (income)	72	28
Non-U.S. Other Postretirement Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	98	136
Interest cost	175	188
Amortization of prior service cost (credit) and recognized actuarial loss (gain)	(5)	(71)
Other	0	0
Net periodic benefit cost (income)	$ 268	$ 253