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Summary of Significant Accounting Policies - Schedule of Other Property and Investments (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Net cash surrender value of COLI policies	$ 80,000,000	$ 74,000,000
Other property	11,000,000	9,000,000
Total	242,096,000	192,004,000
NPL Construction Co [Member]
NPL property and equipment	287,000,000	237,000,000
Accumulated provision for depreciation and amortization	$ (136,000,000)	$ (128,000,000)

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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- Definition

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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