|
Basic and Diluted Net Earnings Per Share - Additional Information (Detail)
|
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Earnings Per Share Disclosure [Line Items] | ||||
| Dilutive shares | 24,356,298 | 24,491,530 | 24,460,623 | 24,625,391 |
|
Common Class A
|
||||
| Earnings Per Share Disclosure [Line Items] | ||||
| Outstanding options to purchase shares | 2,106,674 | 1,114,675 | ||
| Dilutive shares | 213,476 | 212,279 | ||
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|