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Stockholders' Equity - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended |  |  | 0 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 21, 2014 | Mar. 18, 2014 | Mar. 17, 2014 | Jan. 23, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Jun. 20, 2014 Scenario, Forecast [Member] | Apr. 01, 2014 Subsequent Event [Member] | Mar. 31, 2014 Series A Preferred Stock [Member] | Apr. 23, 2014 Series A Preferred Stock [Member] Subsequent Event [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchase authorized amount |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |
Time through the company is allowed to repurchase shares |  |  |  |  |  | Mar. 31, 2015 |  |  |  |  |  |
Common stock repurchased and retired, shares |  |  |  |  |  | 210,836 |  |  |  |  |  |
Common stock repurchased and retired, weighted average exercise price |  |  |  |  |  | $ 37.00 |  |  |  |  |  |
Stock repurchased and retired under the plan, total cost |  |  |  |  |  | 7,805,000 |  |  |  |  |  |
Settlement of stock repurchased and retired under the plan |  |  |  |  | 6,987,000 |  |  |  |  | 818,000 |  |
Stock repurchase program available repurchase amount |  |  |  |  |  | 32,200,000 |  |  |  |  |  |
Fees and commissions average price repurchase common stock |  |  |  |  |  | $ 37.02 |  |  |  |  |  |
Dividends per common share declared |  |  | $ 0.275 | $ 0.275 |  | $ 0.28 | $ 0.23 |  |  |  |  |
Dividends per common share paid | $ 0.275 |  |  |  |  |  |  |  |  |  |  |
Dividends per common share payable |  |  |  |  |  |  |  |  | $ 0.275 |  |  |
Record date of dividend payable |  |  | May 16, 2014 | Feb. 21, 2014 |  |  |  |  |  |  |  |
Date of dividend payable |  |  | Jun. 20, 2014 | Mar. 21, 2014 |  |  |  |  |  |  |  |
Dividends paid | $ 3,193,000 |  |  |  |  | $ 3,206,000 | $ 2,493,000 |  |  |  |  |
Preferred stock conversion cancellation date |  |  |  |  |  |  |  |  |  |  | Apr. 01, 2014 |
Shares of Series A Preferred converted |  |  |  |  |  |  |  |  |  |  | 100,478 |
Preferred stock Dividends rate |  |  |  |  |  |  |  |  |  |  | 7.00% |
Preferred stock, outstanding |  |  |  |  |  |  |  |  |  |  | 10,206 | 3,386
Number of shares issued upon conversion |  |  |  |  |  |  |  |  |  |  | 100,478 |

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