Acquisitions and Dispositions (Preliminary Purchase Price Allocation to Identifiable Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified			12 Months Ended
Dec. 31, 2012	Jun. 20, 2012	Dec. 31, 2012 Customer relationships [Member]	Dec. 31, 2012 Trademarks and trade names [Member]	Dec. 31, 2012 Other [Member]
Business Acquisition [Line Items]
Intangible assets	$ 215,600	$ 215,600	$ 184,500	$ 28,500	$ 2,600
Weighted average life			17 years	20 years	3 years

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant