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Effect of Accounting Change - Additional information (Detail) (USD $) In Millions, unless otherwise specified	Jan. 01, 2012
Accounting Changes And Error Corrections [Abstract]
Cumulative increase to accumulated deficit	$ 88.3

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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