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Equity Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 25, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Stockholders Equity [Line Items] |  |  |
Preferred stock authorized but unissued and undesignated |  | 10,000 | 10,000
Additional amount authorized by Board of Directors | $ 25,000 |  |
Authorization amount for repurchase of common stock | 75,000 |  |
Expiration date on repurchase authorizations |  | Sep. 30, 2014 |
Common stock acquired, shares |  | 2,750 |
Aggregate cost shares of common stock |  | 47,459 |
Since Approval of Share Repurchase Plan [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Common stock acquired, shares |  | 340 |
Aggregate cost shares of common stock |  | 8,323 |
Remaining authorized repurchase amount |  | $ 27,541 |

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