Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Additional Information (Detail)

v2.4.0.6

Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012
Supplemental Guarantor Financial Information [Line Items]
Percentage of guaranteed subsidiaries by the parent companies	100.00%