|
Convertible of Senior Notes - Summary of Hedge Notes (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2014
|
Mar. 31, 2015
|
|
| Derivatives, Fair Value [Line Items] | ||
| Note Hedges, Purchase | $ 85,853 | |
| Note Hedges [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Note Hedges, Contract Date | 2014-03 | |
| Note Hedges, Purchase | $ 85,853 | |
| Underlying Note Hedges, Shares | 7,716,049 | |