Fair Value Measurements, Marketable Securities and Variable Interest Entities - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Dec. 31, 2015 USD ($) Security	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) Security	Dec. 31, 2014 USD ($)	Jun. 30, 2015 USD ($) Security
Schedule of Money Market Funds Available for Sale Securities and Held to Maturity Securities [Line Items]
Marketable securities	$ 0		$ 0		$ 0
Realized gains (losses) from sales of securities	$ 0	$ 0	$ 0	$ 0
Number of securities hold maturity greater than one year | Security	0		0		0
VIE not primary beneficiary [Member]
Schedule of Money Market Funds Available for Sale Securities and Held to Maturity Securities [Line Items]
Maximum exposure to loss as a result of unconsolidated VIE	$ 2,500,000		$ 2,500,000
VIE not primary beneficiary [Member] | Other assets, noncurrent [Member]
Schedule of Money Market Funds Available for Sale Securities and Held to Maturity Securities [Line Items]
Interest recognized at cost	2,500,000		2,500,000		$ 2,500,000
Money market funds [Member]
Schedule of Money Market Funds Available for Sale Securities and Held to Maturity Securities [Line Items]
Money market funds	$ 20,200,000		$ 20,200,000		$ 20,200,000