Advances and other assets consists (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012
Schedule Of Other Assets [Line Items]
Sales type lease unearned income	374,000
Signing bonuses to independent sales agents
Schedule Of Other Assets [Line Items]
Signing bonuses to independent sales agents	contracts from three to ten years
Non-interest bearing advances to independent sales
Schedule Of Other Assets [Line Items]
Advances repayable term	2018
Loans to independent sales agents bearing interest
Schedule Of Other Assets [Line Items]
Loans receivable description of variable rate basis	prime plus 1
Loans receivable basis spread on variable rate	1.00%
Loans repayable term	2021
Sales-type leases
Schedule Of Other Assets [Line Items]
Sales type lease original term	Sales-type leases with original terms of 48 months
Sales type lease term year	2016
Due from independent sales agents and employees
Schedule Of Other Assets [Line Items]
Advances repayable term	2021