Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Held to Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 112,391		$ 85,861
Gross Unrealized Gains	98		99
Gross Unrealized Losses	(43)		(41)
Fair Value	112,446		85,919
Level 2 | Corporate Bonds
Schedule of Held-to-maturity Securities [Line Items]
Fair Value	91,785	[1]	67,470	[1]
Level 3 | Perfect Home Bonds
Schedule of Held-to-maturity Securities [Line Items]
Fair Value	20,661	[2]	18,449	[2]
Corporate Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	91,730		67,412
Gross Unrealized Gains	98		99
Gross Unrealized Losses	(43)		(41)
Perfect Home Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 20,661		$ 18,449

[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 notes 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.