Pension and Other Postretirement Benefits - Change in Benefit Obligation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Obligations [Member]
Change in benefit obligation:
Benefit obligation, beginning of year	$ (263,876)	$ (240,002)
Service cost	(5,554)	(5,423)	(5,863)
Interest cost	(9,310)	(10,510)	(11,687)
Participant contributions	(105)	(146)
Plan amendments	(56)
Actuarial gain (loss)	8,147	(21,785)
Foreign currency exchange rate changes	(1,826)	(2,542)
Benefits paid	14,157	16,532
Benefit obligation, end of year	(258,423)	(263,876)	(240,002)
Other Postretirement Obligations [Member]
Change in benefit obligation:
Benefit obligation, beginning of year	(51,772)	(49,118)
Service cost	(125)	(116)	(92)
Interest cost	(1,910)	(2,077)	(2,199)
Participant contributions	(11)	(11)
Actuarial gain (loss)	2,096	(1,950)
Other		(204)
Foreign currency exchange rate changes	2,681	(886)
Benefits paid	2,427	2,590
Benefit obligation, end of year	$ (46,614)	$ (51,772)	$ (49,118)