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Investment Portfolio - Narrative (Detail)
Jun. 30, 2016
USD ($)
Investments, Debt and Equity Securities [Abstract]  
Fair value of investment $ 58,000,000
Schedule of Trading Securities and Other Trading Assets [Line Items]  
Deferred compensation investments 12,552,132
Trading Securities [Member]  
Schedule of Trading Securities and Other Trading Assets [Line Items]  
Deferred compensation investments 8,300,000
Equity Method Investments [Member]  
Schedule of Trading Securities and Other Trading Assets [Line Items]  
Deferred compensation investments $ 4,300,000