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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 13, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Subsequent Event [Line Items] |  |  |  |  |  |  |
Stock repurchased and retired, total costs |  |  |  | $ 464,000 | $ 792,000 |  |
Dividends per common share |  | $ 0.30 | $ 0.30 | $ 0.90 | $ 0.90 |  |
Common Stock [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Repurchase and retirement of common stock, shares |  |  |  | 14,934 | 17,493 |  |
Share Repurchase Plan [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Stock repurchased and retired, total costs |  |  |  | $ 18,023,000 | $ 1,610,000 |  |
Share Repurchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Dividends per common share | $ 0.30 |  |  |  |  |  |
Date of dividend payable | Dec. 16, 2016 |  |  |  |  |  |
Record date of dividend payable | Nov. 18, 2016 |  |  |  |  |  |
Share Repurchase Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Repurchase and retirement of common stock, shares |  |  |  | 574,851 | 37,869 |  |
Share Repurchase Plan [Member] | 2015 Plan [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common stock repurchase authorized amount |  |  |  |  |  | $ 20,000,000 |
Common stock repurchased and retired, weighted average price |  | $ 30.29 |  | $ 31.31 |  |  |
Stock repurchased and retired, total costs |  | $ 6,008,000 |  | $ 18,023,000 |  |  |
Fees and commissions average price repurchase common stock |  | $ 30.33 |  | $ 31.35 |  |  |
Share Repurchase Plan [Member] | 2015 Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Repurchase and retirement of common stock, shares |  | 198,055 |  | 574,851 |  |  |
Share Repurchase Plan [Member] | 2014 Plan [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common stock repurchase authorized amount |  |  |  |  |  |  | $ 40,000,000
Common stock repurchased and retired, weighted average price |  |  |  |  | $ 42.49 |  |
Stock repurchased and retired, total costs |  |  |  |  | $ 1,610,000 |  |
Fees and commissions average price repurchase common stock |  |  |  |  | $ 42.51 |  |
Time through the company is allowed to repurchase shares |  |  |  |  | Mar. 31, 2015 |  |
Share Repurchase Plan [Member] | 2014 Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Repurchase and retirement of common stock, shares |  |  | 0 |  | 37,869 |  |

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