Accrued Payroll Costs - Components of Accrued Payroll Costs (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accrued Payroll Costs [Abstract]
Payroll and benefits	$ 43,797us-gaap_AccruedEmployeeBenefitsCurrent	$ 43,059us-gaap_AccruedEmployeeBenefitsCurrent
Payroll taxes	3,062us-gaap_AccruedPayrollTaxesCurrent	9,111us-gaap_AccruedPayrollTaxesCurrent
Accrued Insurance, Current	3,417us-gaap_AccruedInsuranceCurrent	2,993us-gaap_AccruedInsuranceCurrent
Workers' compensation liabilities	1,932	1,709
Total	$ 52,208	$ 56,872

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for statutory payroll taxes incurred through that date and withheld from employees pertaining to services received from them, including entity's matching share of the employees FICA taxes and contributions to the state and federal unemployment insurance programs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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