Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Results of Operations (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2015 USD ($)
Operating Expenses [Member]
Quarterly Financial Information [Line Items]
State payroll tax incentive associated with office relocation	$ 1.6
Corporate General and Administrative Expenses [Member]
Quarterly Financial Information [Line Items]
State payroll tax incentive associated with office relocation	$ 0.1