Pension and Other Postretirement Benefits - Amounts Included in Accumulated Other Comprehensive Loss to be Recognized over Next Year (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 5,591
Prior service cost	551
Total amounts included in accumulated other comprehensive loss to be recognized over next year	6,142
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	911
Prior service cost	0
Total amounts included in accumulated other comprehensive loss to be recognized over next year	911
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	233
Prior service cost	(672)
Total amounts included in accumulated other comprehensive loss to be recognized over next year	$ (439)