Fair Value Measurement (Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Financial Assets:
Restricted investments, Carrying Value	[1]	$ 22,717	$ 23,215
Restricted investments, Estimated Fair Value	[1]	22,688	23,190
Financial Liabilities:
2015 Agreement: New Term Loan A, Carrying Value		501,805	679,177
Accounts receivable securitization, Carrying Value		279,285	223,927
Revolving line of credit, Carrying Value	[2]	130,000	200,000
Debt Issuance Costs, Net		3,222	4,264
2015 Agreement, Term Loan A [Member]
Financial Liabilities:
2015 Agreement: New Term Loan A, Carrying Value	[3],[4]	492,912	668,055
2015 Agreement: New Term Loan A, Estimated Fair Value	[4]	494,250	669,750
Debt Issuance Costs, Net		1,338	1,695
2015 RSA [Member]
Financial Liabilities:
Accounts receivable securitization, Carrying Value	[5]	279,285	223,927
Accounts receivable securitization, Estimated Fair Value	[5]	280,000	225,000
Debt Issuance Costs, Net		700	1,100
2015 Agreement, Credit Facility [Member]
Financial Liabilities:
Revolving line of credit, Carrying Value		130,000	200,000
Revolving line of credit, Estimated Fair Value		$ 130,000	$ 200,000

[1] Restricted investments are included in "Restricted investments, held to maturity, amortized cost."

[2] The Company also had outstanding letters of credit under the New Revolver, primarily related to workers' compensation and self-insurance liabilities of $97.0 million at December 31, 2016 and $95.0 million at December 31, 2015.

[3] Refer to Note 21 for information regarding the fair value of debt.

[4] The New Term Loan A is included in "Current portion of long-term debt" and "Long-term debt, less current portion." Carrying value is net of $1.3 million and $1.7 million DLCs as of December 31, 2016 and 2015, respectively.

[5] Carrying value is net of $0.7 million and $1.1 million DLCs as of December 31, 2016 and 2015, respectively.