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Equity Transactions - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders Equity [Line Items] |  |  |
Preferred stock authorized but unissued and undesignated | 10,000 | 10,000 |
Expiration date on repurchase authorizations | Dec. 31, 2019 |  |
Aggregate cost shares of common stock | $ 9,606 | $ 1,510 | $ 15,367
Common stock acquired, shares | 91 |  |
Maximum |  |  |
Stockholders Equity [Line Items] |  |  |
Authorization amount for repurchase of common stock | $ 175,000 |  |
Common Stock [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Cumulative common stock acquired, shares | 3,600 |  |
Since Initial Approval of Share Repurchase Plan in 2011 [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Aggregate cost shares of common stock | $ 86,898 |  |
Remaining authorized repurchase amount | $ 88,102 |  |

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