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Long-Term Debt (3.875% Convertible Senior Notes) - Additional Information (Detail) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2015 $ / shares | Mar. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Repurchase of convertible senior notes |  |  | $ 11,347 |
Unamortized debt discount and issuance costs |  |  | $ (10,004) | $ (13,821)
Convertible Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Convertible debt, conversion price | $ / shares |  |  | $ 62.18 |
Convertible debt, conversion ratio |  |  | 16.0833 |
Aggregate amount of debt repurchased |  | $ 13,010 |  |
Repurchase of convertible senior notes |  | 11,347 |  |
Commission related to repurchases of convertible senior notes |  | 81 |  |
Gain on extinguishment of debt |  | 153 |  |
Unamortized debt discount and issuance costs |  | $ 1,591 |  |
Convertible Senior Notes [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Cash dividends on common stock | $ / shares | $ 0.275 |  |  |

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