Changes in Self Insurance Reserves (Detail) (USD $)	6 Months Ended	12 Months Ended
Jun. 30, 2014	Dec. 31, 2013
Disclosure Changes in Self Insurance Reserves [Abstract]
Beginning Balance	$ 27,600,000	$ 55,800,000
Accruals (reversals), net	13,700,000	(900,000)
Payments	(14,700,000)	(27,300,000)
Ending Balance	$ 26,600,000	$ 27,600,000

Total amount of payments made during the reporting period to settle insured claims and pay costs incurred in the claims settlement process.

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

-Publisher SEC

-Name Financial Reporting Release (FRR)

-Number 403

-Paragraph 04

-Subparagraph b

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437

Name:	us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration