Pension and Other Postretirement Benefits - Summary of Accumulated Other Comprehensive Loss, Changes in these Amounts and Expected Amortization of these Amounts as Components of Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Pension Benefits [Member]
Pension And Other Employee Benefit Plans [Line Items]
Net actuarial loss, beginning of year	$ 79,370
Net actuarial loss	46,468
Amortization cost	(6,388)
Net prior service credit	(107)
Actuarial gain	(8,147)
Total	46,361
Asset gain	(18,350)
Currency impact	(17)
Net actuarial loss, end of year	46,468
Prior service credit, beginning of year	(224)
Amortization credit	54
Plan amendment	56
Currency impact	7
Prior service credit, end of year	(107)
Amortization of prior service credit	(47)
Amortization of net loss	4,166
Total	4,119
Other Benefits [Member]
Pension And Other Employee Benefit Plans [Line Items]
Net actuarial loss, beginning of year	13,116
Net actuarial loss	9,622
Amortization cost	(932)
Net prior service credit	(259)
Actuarial gain	(2,096)
Total	9,363
Currency impact	(466)
Net actuarial loss, end of year	9,622
Prior service credit, beginning of year	(389)
Amortization credit	108
Currency impact	22
Prior service credit, end of year	(259)
Amortization of prior service credit	(104)
Amortization of net loss	606
Total	$ 502