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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 26, 2016 | Sep. 15, 2016 | Sep. 30, 2016 | Sep. 06, 2013
Class Of Stock [Line Items] |  |  |  |
Shares issued for acquisition, value |  |  | $ 6,733,000 |
Common Stock |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Shares issued for acquisition |  | 353,804 | 354,000 |
Shares issued for acquisition, value |  | $ 6,700,000 | $ 3,000 |
2013 program |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Remaining amount approved for repurchases under stock buyback program |  |  | $ 187,000,000 |
2013 program | Maximum |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Amount approved for repurchases under stock buyback program |  |  |  | $ 200,000,000
Subsequent Event | Dividend Declared |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Dividend declaration date | Oct. 26, 2016 |  |  |
Dividend per share, declared | $ 0.02 |  |  |
Dividend payment date | Dec. 22, 2016 |  |  |
Dividend record date | Dec. 08, 2016 |  |  |

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