Annual report pursuant to Section 13 and 15(d)

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%