| Restricted Stock Unit Outstanding (Parenthetical) (Detail) (Restricted Stock Units (RSUs), Restricted Stock Units subject to service and other requirements) | 12 Months Ended | 
|---|---|
| Dec. 31, 2013 | |
| Minimum | 2014 | |
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |
| Restricted Stock Units adjustments, percentage | 0.00% | 
| Minimum | 2015 | |
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |
| Restricted Stock Units adjustments, percentage | 0.00% | 
| Maximum | 2014 | |
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |
| Restricted Stock Units adjustments, percentage | 200.00% | 
| Maximum | 2015 | |
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |
| Restricted Stock Units adjustments, percentage | 200.00% | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Definition Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Percentage Adjustments in Period No definition available. 
 |