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Summary of Significant Accounting Policies - Additional Information (Detail) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
Summary Of Significant Accounting Policies [Line Items]  
Balance in excess of FDIC-insured limits $ 24.8
Minimum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Ownership interest in equity method investment 20.00%
Maximum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Ownership interest in equity method investment 50.00%
Short-Term Investments [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Original maturity period No more than 26 weeks
Noncurrent Restricted Investments [Member] | CD [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Original maturity period No longer than approximately 26 weeks