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Related Party Transactions - Additional Information (Detail) - $ / shares | Aug. 16, 2017 | May 09, 2017 | Jan. 03, 2017
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Officer [Member] |  |  |
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
Trust [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Purchase of shares | 24,920 |  |
Shares price per share | $ 50.16 |  |
Number of trading days to be considered for average price of stock repurchased | 30 days |  |

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