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Equity - Treasury Stock (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Payments for repurchase of common stock | $ 173,913,000 | $ 0 |  |
2017 Repurchase Program |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury stock acquired (in shares) | 5,000,000.0 |  | 1,400,000.0 |
Payments for repurchase of common stock | $ 173,900,000 |  | $ 50,000,000 |
2017 Repurchase Program | Maximum |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  |  |  | $ 300,000,000
Treasury Stock Associated with Deferred Compensation Plans |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury stock acquired, value | $ 3,300,000 | $ 3,200,000 |  |
Common Stock Withheld for Settlement of Employee Tax Liabilities |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury stock acquired (in shares) | 400,000 | 500,000 |  |
Treasury stock acquired, value | $ 13,400,000 | $ 17,100,000 |  |

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