Fair Value of Assets (Liabilities) Not Measured at Fair Value In Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 91,949		$ 85,919
Corporate Bond | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	74,278	[1]	67,470	[1]
Perfect Home Bonds | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	17,671	[2]	18,449	[2]
Fixed Rate | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	$ (128,076)	[3]	$ (127,261)	[3]

[1] The fair value of corporate bonds is determined through the use of model-based valuation techniques for which all significant assumptions are observable in the market.

[2] The Perfect Home bonds were initially valued at cost. The Company periodically reviews the valuation utilizing company-specific transactions or changes in Perfect Home's financial performance to determine if fair value adjustments are necessary.

[3] The fair value of fixed-rate long term debt is estimated using the present value of underlying cash flows discounted at a current market yield for similar instruments. The carrying value of fixed-rate long term debt was $125.0 million at March 31, 2013 and December 31, 2012.