Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Significant Accounting Policies [Line Items]
Earnings from equity investment	$ 556,000	$ 1,171,000	$ 857,000
Net investment income	4,100,000	3,300,000
Auction rate securities, par value			13,000,000
Auction rate securities value			10,400,000
Proceeds from the sale of auction rate securities			11,408,000
Gain on sale of auction rate securities			988,000
Service contract period	1 year
Advertising expenses	600,000	600,000	600,000
Post-emergence professional fees	0	296,000	727,000
Reorganization items	0	0	26,156,000
Pre Adoption | Accounting Standards Update 2009-13
Significant Accounting Policies [Line Items]
Recognition of deferred revenue	300,000	31,500,000
After Adoption | Accounting Standards Update 2009-13
Significant Accounting Policies [Line Items]
Recognition of deferred revenue		$ 45,600,000
UNITED KINGDOM
Significant Accounting Policies [Line Items]
Equity method investment ownership percentage	25.10%	25.10%
Maximum
Significant Accounting Policies [Line Items]
Cash equivalents original maturity period	3 months
Equity method investment ownership percentage	50.00%
Standard warranty period	24 months
Payment terms	180 days
Maximum | Buildings and improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	30 years
Maximum | Machinery and Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	13 years
Minimum
Significant Accounting Policies [Line Items]
Equity method investment ownership percentage	20.00%
Standard warranty period	12 months
Minimum | Buildings and improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	3 years
Minimum | Machinery and Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	1 year