Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2012
Buildings and improvements | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of property, plant, and equipment	25 years
Buildings and improvements | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of property, plant, and equipment	40 years
Furniture and Fixtures | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of property, plant, and equipment	2 years
Furniture and Fixtures | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of property, plant, and equipment	15 years