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Pension Benefits - Changes in Benefit Obligation and Fair Value of Benefit Plans Assets (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Amortized from accumulated other comprehensive (loss) income into net periodic benefit cost	$ (1.2)

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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