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Computed Amount and Differences in Provision for Income Taxes (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012
Loss Or Income Before Income Taxes [Line Items]
Statutory tax rate	35.00%

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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