Contingency - Additional Information (Detail) (USD $)	12 Months Ended	0 Months Ended
	Feb. 28, 2015	Mar. 30, 2015	Mar. 06, 2015	Mar. 31, 2015
Loss Contingencies [Line Items]
Contingencies description	In accordance with ASC Topic 450, "Contingencies," the Corporation accrues for these contingencies by a charge to income when it is both probable that one or more future events will occur confirming the fact of a loss and the amount of the loss can be reasonably estimated.
Subsequent Event [Member]
Loss Contingencies [Line Items]
Settlement fund to pay claims		$ 4,000,000
Subsequent Event [Member] | Violation of Telephone Consumer Protection Act [Member]
Loss Contingencies [Line Items]
Damage amount for each violation			500.00
Subsequent Event [Member] | Willful Violation of Telephone Consumer Protection Act [Member]
Loss Contingencies [Line Items]
Damage amount for each violation			$ 1,500.00
Subsequent Event [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Period of funding settlement				20 days