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Stockholders' Equity - Additional Information (Detail) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Aug. 09, 2013
Class Of Stock [Line Items] |  |  |  |
Preferred stock redemption date | Aug. 09, 2013 |  |  |
Preferred stock dividend rate |  |  | 5.50% |
Preferred stock outstanding |  |  | 0 | 61,735
Number of Preferred shares converted |  |  | 60,900 |
Number of common shares issued upon conversion of preferred stock |  |  | 139,029 |
Preferred shares redeemed |  |  | 835 |
Aggregate redemption price |  |  | $ 25.26354 |
Treasury stock, shares | 3,428,541 | 3,384,443 |  |
Shares purchased during period | 41,915 | 154,633 | 60,595 |
Treasury stock distributed under deferred compensation plan | 4,563 |  |  |
Stock purchased to settle employees statutory withholding taxes relates to performance stock awards and deferred compensation distribution | 6,746 |  |  |
Open Market Repurchases [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Shares purchased during period | 41,915 |  |  |
Price per share [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Aggregate redemption price |  |  | $ 25.00 |
Accrued and Unpaid Dividends [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Aggregate redemption price |  |  | $ 0.26354 |

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