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Stock Compensation Plans - Additional Information (Detail)
1 Months Ended 12 Months Ended
Mar. 31, 2010
Dec. 31, 2012
2008-2010 Cycle (Cycle VIII) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of target dollar value of the award converted to a number of notional shares   50.00%
Shares of common stock issued 78,072  
Long-Term Incentive Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period, in years   3 years
Target payout percentage, cash   50.00%
Target payout percentage, stock   50.00%
2009-2011 Cycle (Cycle IV) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares of common stock issued   128,293
2010-2012 Cycle [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares of common stock issued   119,561
2010 Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized for issuance   2,749,669
Shares remaining available for issuance   749,669
Shares subject to outstanding awards   1,866,473
Shares remaining available for future awards   1,814,093
RSU's [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period, in years   3 years