Future Minimum Renal Payments Under Lease Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future Minimum Payments Under Non-Cancelable Operating Leases With Initial Terms Of One-Year Or More [Line Items]
Capital Leases, 2012	$ 2,162
Capital Leases, 2013	1,369
Capital Leases, 2014	1,158
Capital Leases, 2015	1,068
Capital Leases, 2016	1,077
Capital Leases, Later years	5,117
Capital Leases, Total minimum rental	11,951
Less: Amount representing interest	(3,684)
Present value of minimum rental commitments	8,267
Less: Current portion of capital lease obligations	(1,585)
Long-term portion of capital lease obligations	6,682
Operating Leases, 2012	58,638
Operating Leases, 2013	50,973
Operating Leases, 2014	43,496
Operating Leases, 2015	36,952
Operating Leases, 2016	21,906
Operating Leases, Later years	102,722
Operating Leases, Total minimum rental	$ 314,687

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.