Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		1 Months Ended
	Dec. 31, 2014 Segment	Dec. 31, 2013	Jul. 31, 2013	Feb. 28, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Number of reportable segments	2
Purchase price of acquired entity	$ 31.6	$ 37.7
Investment securities maturity period for consideration as cash equivalents, in days	90 days
Bonaire [Member]
Business Acquisition [Line Items]
Purchase price of acquired entity			37.6
Emerald [Member]
Business Acquisition [Line Items]
Purchase price of acquired entity				59.8
TwoFour Systems [Member]
Business Acquisition [Line Items]
Purchase price of acquired entity					$ 31.6