Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Held to Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 106,441	$ 112,391
Gross Unrealized Gains	159	98
Gross Unrealized Losses	(25)	(43)
Fair Value	106,575	112,446
Corporate Bond
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	85,190	91,730
Gross Unrealized Gains	159	98
Gross Unrealized Losses	(25)	(43)
Fair Value	85,324	91,785
Perfect Home Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	21,251	20,661
Fair Value	$ 21,251	$ 20,661