XML 21 R34.htm IDEA: XBRL DOCUMENT v2.4.0.8
Common Stock and Stock-Based Compensation Plans - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Stockholders Equity Note [Line Items]  
Options granted under stock incentive plans vesting rate, year one 25.00%
Unrecognized compensation expense $ 7,104
Unrecognized compensation expense, weighted-average period of recognition 1 year 4 months 24 days
Maximum
 
Stockholders Equity Note [Line Items]  
Shares vesting period 4 years
Stock appreciation rights (SARs)
 
Stockholders Equity Note [Line Items]  
Options granted percentage 400.00%