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Stock Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 12 Months Ended
Mar. 08, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 08, 2012
Year 1 [Member]
Mar. 08, 2012
Year 2 [Member]
Mar. 08, 2012
Year 3 [Member]
Mar. 08, 2012
Chief Executive Officer [Member]
Mar. 08, 2012
Chief Operating Officer [Member]
Mar. 08, 2012
Minimum [Member]
Mar. 08, 2012
Minimum [Member]
Year 1 [Member]
Mar. 08, 2012
Minimum [Member]
Year 2 [Member]
Mar. 08, 2012
Minimum [Member]
Year 3 [Member]
Mar. 08, 2012
Maximum [Member]
Mar. 08, 2012
Performance Shares [Member]
Dec. 31, 2012
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Recognized option awards   $ 0.8 $ 3.6 $ 2.8 $ 4.7                        
Recognized restricted stock grants   1.0 1.5 2.4 3.0                        
Long term performance-based non qualified stock option grants                 500,000 500,000              
Option vesting per value One third                                
Home gross margin                     16.70%            
Increase in total revenue over 2011                       10.00% 15.00% 20.00%      
Option Shares vest           166,667 166,667 166,666                  
Grant date fair value                               $ 7.42  
Potential expense that would be recognized if all of the performance targets are met                             7.4    
Total share-based compensation expense related to stock options                                 $ 6.2