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Share Repurchase (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Jan. 31, 2020 | Nov. 07, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Total number of share repurchases | 1,755,160 | 1,131,124 | 2,673,967 | 2,365,451 | 5,219,123 |  |
Total cost of share repurchases | $ 59,764 | $ 56,758 | $ 100,019 | $ 115,933 | $ 217,899 |  |
Average price paid per share | $ 34.05 | $ 50.18 | $ 37.40 | $ 49.01 | $ 41.75 |  |
Authorized On January Thirty-One Two-Thousand Twenty [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Authorized amount for repurchase |  |  |  |  |  | $ 300,000 |
Maximum | Authorized on November 7, 2018 |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Authorized amount for repurchase |  |  |  |  |  |  | $ 300,000
Remaining authorized amount for repurchase | $ 82,100 |  | $ 82,100 |  | $ 82,100 |  |

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