Property, Plant and Equipment - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant, and Equipment Disclosure [Line Items]
Depreciation expense		$ 12,300,000	$ 12,500,000	$ 12,600,000
Capital Lease Obligations		800,000
Accumulated depreciation on Capital Lease		135,823,000	125,708,000
Impairment Charges Land Held For Use	5,600,000	1,200,000
Capital Lease
Property, Plant, and Equipment Disclosure [Line Items]
Depreciation expense		53,000	53,000	53,000
Accumulated depreciation on Capital Lease		$ 291,000	$ 238,000	$ 185,000