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Stock Buy Back Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 02, 2016
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Purchase of treasury shares |  | $ 100,000,000 | $ 28,823,000 |
Class A Common Stock [Member] |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program, authorized amount |  |  |  | $ 100,000,000
Purchase of treasury shares (in shares) | 0 | 2,672,227 |  |
Class A Common Stock [Member] | Employee Restricted Stock Plan [Member] |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Stock tendered for payments of withholding taxes (in shares) | 77,988 | 73,546 |  |
Purchase of treasury shares | $ 3,400,000 | $ 2,500,000 |  |

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