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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 16, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Subsequent Event [Line Items] |  |  |  |  |  |
Stock repurchased and retired, total costs |  |  |  | $ 772,000 | $ 597,000 |
Dividends per common share |  | $ 0.30 | $ 0.27 | $ 0.60 | $ 0.55 |
Common Stock [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Repurchase and retirement of common stock, shares |  |  |  | 16,958 | 13,541 |
Share Repurchase Plan [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock repurchase authorized amount |  |  |  |  |  | $ 40,000,000
Common stock repurchased and retired, weighted average price |  |  | $ 36.03 | $ 42.49 | $ 36.45 |
Stock repurchased and retired, total costs |  |  | $ 10,005,000 | $ 1,610,000 | $ 17,810,000 |
Fees and commissions average price repurchase common stock |  |  | $ 36.05 | $ 42.51 | $ 36.47 |
Time through the company is allowed to repurchase shares |  |  |  | Mar. 31, 2015 |  |
Share Repurchase Plan [Member] | Common Stock [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Repurchase and retirement of common stock, shares |  | 0 | 277,510 | 37,869 | 488,346 |
Share Repurchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends per common share | $ 0.30 |  |  |  |  |
Date of dividend payable | Sep. 18, 2015 |  |  |  |  |
Record date of dividend payable | Aug. 21, 2015 |  |  |  |  |

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