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Stockholders' Equity - Additional Information (Detail) - $ / shares |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Oct. 07, 2015 | Sep. 30, 2015 | Sep. 30, 2015 | Aug. 10, 2015
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Number of additional shares authorized to be repurchased |  |  |  | 6,782,700
Outstanding authorization shares |  |  |  | 7,500,000
Repurchase of shares |  | 110,000 | 144,000 |
Shares repurchased average price |  |  | $ 74.61 |
Subsequent Event [Member] |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Repurchase of shares | 130,000 |  |  |
Shares repurchased average price | $ 70.31 |  |  |
Stock repurchase remaining number of shares authorized to be repurchased | 7,116,000 |  |  |

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