Equity - Additional Information (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
Aug. 31, 2015 |
|
Stockholders Equity Note [Line Items] | |||||
Common stock authorized to repurchase by Board | $ 100,000,000 | ||||
Shares repurchased pursuant to authorization | 2,451,523 | ||||
Available authorization remaining for repurchase | $ 65,000,000 | $ 65,000,000 | |||
Convertible notes | |||||
Stockholders Equity Note [Line Items] | |||||
Securities excluded in the calculation of diluted earnings per share | 21,292,309 | 21,292,309 | |||
Equity awards | |||||
Stockholders Equity Note [Line Items] | |||||
Securities excluded in the calculation of diluted earnings per share | 163,296 | 57,514 | 180,897 | 66,129 |