Schedule of Amounts Recorded within Statement of Financial Position (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure
Retirement plans assets	$ 3,282	$ 8,840
Accrued employees' compensation and withholdings	(2,810)	(2,524)
Retirement plans liabilities	(74,071)	(57,014)
Funded status	(73,599)	(50,698)
Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure
Accrued employees' compensation and withholdings	(1,322)	(1,484)
Retirement plans liabilities	(10,585)	(11,309)
Funded status	$ (11,907)	$ (12,793)