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Other Assets - Additional Information (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Schedule Of Other Assets [Line Items] |
Purchase of held to maturity securities | $ 99.2
Convertible Preferred Stock | Record Holdings Pty Limited |
Schedule Of Other Assets [Line Items] |
Cost method investment | $ 15.0
Investment percentage | 20.00%

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