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Stockholders' Equity - Additional Information (Detail) - $ / shares | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jul. 27, 2017 | Jun. 30, 2017
Equity Class Of Treasury Stock [Line Items] |  |
Repurchase of shares |  | 20,000
Shares repurchased average price |  | $ 94.03
Subsequent Event [Member] |  |
Equity Class Of Treasury Stock [Line Items] |  |
Repurchase of shares | 65,000 |
Shares repurchased average price | $ 92.74 |
Stock repurchase remaining number of shares authorized to be repurchased | 4,712,200 |

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