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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Effective rate of tax	(3.90%)	13.60%	11.80%	11.80%
Statutory federal income tax rate	35.00%		35.00%
Unrecognized tax benefits	$ 17.3		$ 17.3		$ 17.1
Change in unrecognized tax benefits			0.2
Amount of mandatory security deposit paid related to Notice of Objection			14.2
Amount of additional mandatory security deposit paid related to Notice of Objection	$ 0.4		$ 0.4

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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