Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) (Money market accounts, USD $)	Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market accounts	$ 10,000	[1]
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market accounts	$ 10,000	[1]

[1] Included in cash and cash equivalents on the accompanying consolidated balance sheet.