Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Held to Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 92,926	$ 112,391
Gross Unrealized Gains	166	98
Gross Unrealized Losses	(7)	(43)
Fair Value	93,085	112,446
Corporate Bond
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	70,514	91,730
Gross Unrealized Gains	166	98
Gross Unrealized Losses	(7)	(43)
Fair Value	70,673	91,785
Perfect Home Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	22,412	20,661
Fair Value	$ 22,412	$ 20,661