Commitments and Contingencies (Narrative) (Detail) (USD $)	1 Months Ended	6 Months Ended
	Jul. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Commitments And Contingencies [Abstract]
Loss Contingency, Settlement Agreement, Date	July 2013
Litigation Settlement, Expense		$ 8,000,000
Self insurance deductible for workers compensation		1,000,000
Self insurance deductible for general liability claims		1,000,000
Self insurance deductible for medical and dental coverage		350,000
Self insured risk accruals		26,300,000	22,900,000
Receivable for Medical and Dental Coverage		$ 122,000	$ 205,000