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Incentive Compensation Plan - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Feb. 24, 2012
Jan. 17, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2010
Restricted Stock [Member]
Nov. 21, 2011
Executive [Member]
Restricted Stock [Member]
Jan. 22, 2010
Executive [Member]
Restricted Stock [Member]
Apr. 01, 2008
Executive [Member]
Restricted Stock [Member]
Nov. 12, 2007
Executive [Member]
Restricted Stock [Member]
Dec. 31, 2012
Executive [Member]
Restricted Stock [Member]
Feb. 24, 2012
Executive [Member]
Restricted Stock [Member]
Long-Term Incentive Plan [Member]
Feb. 24, 2012
Executive [Member]
Restricted Stock [Member]
Annual Incentive Plan [Member]
Dec. 31, 2012
Executive [Member]
Restricted Stock [Member]
Annual Incentive Plan [Member]
Maximum number of shares that are available to be awarded     5,000,000                          
Shares eligible for awards     4,507,841                          
Common stock issued to executive                 10,000 30,120 12,654 35,000 25,000 34,000 90,000 100,000
Fair value of restricted stock     $ 5.65 $ 6.13 $ 5.70 $ 5.96 $ 7.03   $ 4.41 $ 5.70 $ 12.35 $ 10.95 $ 6.82 $ 5.96 $ 5.96 $ 5.26
Expiration of compensation plan     Oct. 15, 2015           Nov. 21, 2014 Jan. 22, 2012 Apr. 01, 2011 Nov. 12, 2010 Apr. 01, 2016 Dec. 31, 2014 Feb. 24, 2014 Jan. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights One-year period One-year period             The restricted stock fully vests at the end of a three year period Two year period Three year period Three year period Five year period   The restricted stock fully vests at the end of a two year period The restricted stock fully vests equally over a four year period
Compensation expense           $ 395,000 $ 249,000 $ 244,000                
Unrecognized compensation cost related to unvested restricted stock           1,600,000                    
Percentage of target award if thresholds are met 40.00% 40.00%                            
Percentage of target award if performance targets are met 100.00% 100.00%                            
Percentage of target award if performance target exceeds 200.00% 200.00%                            
Performance based Stock Award period 3 years 3 years                            
Options granted under plan     4,500,000                          
Vesting period of restricted stock     10 years                          
Intrinsic value of stock options exercised     $ 1.41 $ 1.17                        
Options exercised     130,672 13,760 0.00