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Accumulated other comprehensive loss expected to be recognized as components of net periodic benefit cost (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss	$ 21,452
Other Pension Plans Defined Benefit Member
Defined Benefit Plan Disclosure [Line Items]
Net loss	$ 1,330

The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

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