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Incentive Compensation Plan - Additional Information (Detail) (USD $)
0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Jan. 28, 2013
Feb. 24, 2012
Jan. 17, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Aug. 16, 2013
Executive [Member]
Restricted Stock [Member]
May 31, 2013
Executive [Member]
Restricted Stock [Member]
Mar. 01, 2013
Executive [Member]
Restricted Stock [Member]
Jan. 28, 2013
Executive [Member]
Restricted Stock [Member]
Jan. 02, 2012
Executive [Member]
Restricted Stock [Member]
Apr. 01, 2011
Executive [Member]
Restricted Stock [Member]
Feb. 24, 2012
Executive [Member]
Restricted Stock [Member]
Nov. 21, 2011
Executive [Member]
Restricted Stock [Member]
Jan. 17, 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]
Feb. 24, 2012
Executive [Member]
Restricted Stock [Member]
Annual Incentive Plan [Member]
Feb. 24, 2012
Executive [Member]
Restricted Stock [Member]
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                              
Maximum number of shares that are available to be awarded       5,000,000                                      
Common stock issued to executive                   3,000 45,000 10,000 128,611,000 100,000 25,000 68,000,000 10,000 54,166,000 30,120 12,654 35,000 90,000 34,000
Fair value of restricted stock       $ 7.25 $ 5.65 $ 6.13 $ 8.82     $ 7.57 $ 7.21 $ 7.35   $ 5.26 $ 6.82   $ 4.41   $ 5.70 $ 12.35 $ 10.95 $ 5.96 $ 5.96
Expiration of compensation plan                   Aug. 16, 2016 May 31, 2016 Mar. 01, 2016   Jan. 01, 2016 Apr. 01, 2016   Nov. 21, 2014   Jan. 22, 2012 Apr. 01, 2011 Nov. 12, 2010 Feb. 24, 2015 Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights                   1 3 1   4 1   1   2 3 3 1 1
Compensation expense             $ 509,000 $ 395,000 $ 249,000                            
Unrecognized compensation cost related to unvested restricted stock             2,200,000                                
Options granted under plan       4,500,000                                      
Vesting period of restricted stock 1 year 1 year 1 year 10 years                                      
Intrinsic value of stock options exercised       $ 1.41 $ 1.17                                    
Options exercised       0 130,672 13,760                                  
Granted, Shares       0 0 0                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       4,330,038