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Pension and Employee Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	9 Months Ended
	Aug. 27, 2013 Pension_Plan	Sep. 30, 2013 Pension_Plan	Dec. 31, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Effective date of retirement for availing post retirement health care plan		Jan. 01, 1990
Minimum age for the retirees to elect desired health care plan		65 years
Number of defined benefit pension plans	2	2
Liability for frozen defined benefit pension plans	$ 5,709		$ 3,075
Defined benefit plan contributions		157
Pension plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Anticipated contribution to fund the pension plan during the reminder of the fiscal year		303
Health care plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Anticipated contribution to fund the pension plan during the reminder of the fiscal year		$ 4