Summary of Long-Term Debt and Related Weighted Average Interest Rates (Parenthetical) (Detail)	1 Months Ended	9 Months Ended	12 Months Ended
Mar. 26, 2010	Sep. 29, 2012	Dec. 31, 2011
7.875% Senior Notes due 2018
Debt Instrument [Line Items]
Long-term debt, stated coupon rate		7.875%	7.875%
Long-term debt, maturity date	Mar. 15, 2018	Mar. 15, 2018	Mar. 15, 2018
8.125% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt, stated coupon rate		8.125%	8.125%
Long-term debt, maturity date	Mar. 15, 2020	Mar. 15, 2020	Mar. 15, 2020

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration