Contingency - Additional Information (Detail) - USD ($)	Mar. 30, 2015	Mar. 06, 2015
Loss Contingencies [Line Items]
Settlement fund to pay claims	$ 4,000,000
Violation of Telephone Consumer Protection Act [Member]
Loss Contingencies [Line Items]
Damage amount for each violation		$ 500
Willful Violation of Telephone Consumer Protection Act [Member]
Loss Contingencies [Line Items]
Damage amount for each violation		$ 1,500