Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		0 Months Ended	1 Months Ended
	Sep. 30, 2014 Segment	Sep. 30, 2013	Mar. 31, 2014 Bonaire [Member]	Feb. 28, 2014 Emerald [Member]
Business Acquisition [Line Items]
Number of reportable segments	2
Investment securities maturity period for consideration as cash equivalents, in days	90 days
Acquisitions, net of cash acquired		$ 37.7	$ 37.6	$ 60.0