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Stock Buy Back Plans - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2016 | Jul. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Apr. 30, 2016 | Mar. 31, 2016 | Feb. 28, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 02, 2016
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares (in shares) | 299,931 | 66,422 | 330,265 | 307,798 | 454,729 | 269,099 | 943,983 | 2,672,227 |  |  |
Purchase of treasury shares |  |  |  |  |  |  |  | $ 100,000,000 | $ 28,823,000 | $ 18,024,000 |
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) |  |  |  |  |  |  |  | 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) |  |  |  |  |  |  |  | 73,546 | 77,732 |  |
Purchase of treasury shares |  |  |  |  |  |  |  | $ 2,500,000 | $ 2,900,000 |  |

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