Pension and Other Postretirement Benefits - Schedule of Changes in Projected Benefit Obligations (PBO) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. Pension Benefits [Member]
Change in projected benefit obligations:
PBO, beginning balance	$ 181,803	$ 205,399
Åkers acquisition - PBO at March 3	68,081	0
Service cost	1,714	2,743	$ 3,683
Interest cost	9,977	7,990	8,762
Plan amendments	0	447
Plan settlements	(2,739)	(5,494)
Plan curtailments	(1,181)	(10,306)
Foreign currency exchange rate changes	0	0
Actuarial (gain) loss	(160)	(9,880)
Participant contributions	0	0
Benefits paid from plan assets	(12,679)	(8,772)
Benefits paid by the Corporation	(376)	(324)
PBO, Ending balance	244,440	181,803	205,399
Foreign Pension Benefits [Member]
Change in projected benefit obligations:
PBO, beginning balance	63,750	70,523
Åkers acquisition - PBO at March 3	5,393	0
Service cost	314	0	0
Interest cost	2,250	2,394	2,695
Plan amendments	0	0
Plan settlements	0	0
Plan curtailments	0	0
Foreign currency exchange rate changes	(11,477)	(3,413)
Actuarial (gain) loss	8,869	(4,005)
Participant contributions	0	0
Benefits paid from plan assets	(2,189)	(1,749)
Benefits paid by the Corporation	0	0
PBO, Ending balance	66,910	63,750	70,523
Other Postretirement Benefits [Member]
Change in projected benefit obligations:
PBO, beginning balance	8,117	13,739
Åkers acquisition - PBO at March 3	17,467	0
Service cost	504	384	505
Interest cost	722	474	688
Plan amendments	(4,762)	(4,437)
Plan settlements	0	0
Plan curtailments	0	0
Foreign currency exchange rate changes	0	0
Actuarial (gain) loss	(1,598)	(1,433)
Participant contributions	80	79
Benefits paid from plan assets	0	0
Benefits paid by the Corporation	(1,471)	(689)
PBO, Ending balance	$ 19,059	$ 8,117	$ 13,739