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Equity Transactions - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stockholders Equity [Line Items] |  |  |
Preferred stock authorized but unissued and undesignated | 10,000,000 | 10,000,000 |
Expiration date on repurchase authorizations | Sep. 30, 2016 |  |
Aggregate cost shares of common stock | $ 11,279,000 | $ 1,676,000 | $ 8,323,000
Common stock acquired, shares | 288,000 |  |
Maximum [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Authorization amount for repurchase of common stock | $ 75,000,000 |  |
Common Stock [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Common stock acquired, shares | 3,076,000 |  |
Since Approval of Share Repurchase Plan [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Aggregate cost shares of common stock | $ 60,414,000 |  |
Remaining authorized repurchase amount | $ 14,586,000 |  |

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