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Stock and Stock-based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Director
Dec. 31, 2012
Director
Dec. 31, 2013
Minimum
Director
Dec. 31, 2013
Maximum
Director
Feb. 28, 2014
Subsequent Event
Dec. 31, 2013
Restricted Stock Units (RSUs)
Dec. 31, 2012
Restricted Stock Units (RSUs)
May 31, 2010
Restricted Stock Units (RSUs)
Jun. 30, 2012
Maximum
Restricted Stock Units (RSUs)
May 31, 2010
Maximum
Restricted Stock Units (RSUs)
Dec. 31, 2013
Restricted Stock Units (RSUs)
Dec. 31, 2012
Restricted Stock Units (RSUs)
Dec. 31, 2013
Restricted Stock Units (RSUs)
General and Administrative Expense
Dec. 31, 2012
Restricted Stock Units (RSUs)
General and Administrative Expense
Feb. 28, 2014
Restricted Stock Units (RSUs)
Subsequent Event
Dec. 31, 2013
Stock Options
General and Administrative Expense
Dec. 31, 2012
Stock Options
General and Administrative Expense
Dec. 31, 2013
Board of Directors Compensation
General and Administrative Expense
Director
Dec. 31, 2012
Board of Directors Compensation
General and Administrative Expense
Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                          
Granted restricted stock unit             168,000 235,000 285,000       234,525 283,998     150,000        
Shares available for issuance under the plan                   300,000 1,100,000 800,000                  
Conversion of stock RSU to Common, ratio               1                          
Convert to common stock               25.00%                          
Stock compensation Expense                             $ 818,000 $ 342,000   $ 20,000 $ 16,000 $ 32,000 $ 27,000
Additional compensation cost that will be recognized in future periods 2,000,000                                        
Weighted average period additional compensation cost will be expensed                         2 years                
Unrecognized compensation cost related to stock option $ 0                                        
Percentage of retainer fee to acquire common stock         50.00% 100.00%                              
Stock and Stock Based Compensation (Textual) [Abstract]                                          
Employee Stock Purchase Plan, Stock issued 4,697 4,839                                      
Stock options issued 0 0                                      
Stock units acquired by directors deferred retainer fee     6,000 6,000                                  
Increment period for awards converted into common stock                         4 years