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Related Party Transactions - Additional Information (Detail) - Officer [Member] - $ / shares | May 09, 2017 | Jan. 03, 2017
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Related Party Transaction [Line Items] |  |
Purchase of shares | 2,500 | 1,834
Shares price per share | $ 52.05 | $ 58.58
Number of trading days to be considered for average price of stock repurchased | 30 days | 30 days

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- Details
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