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Debt - Additional Information (Detail) (USD $)
3 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Interest Rate Swap Agreements
Mar. 31, 2013
Revolving Credit Facility
Mar. 31, 2013
Revolving Credit Facility
Minimum
Mar. 31, 2013
Revolving Credit Facility
Maximum
Mar. 31, 2013
Revolving Credit Facility
Alternate Base Rate
Mar. 31, 2013
Revolving Credit Facility
Alternate Base Rate
Minimum
Mar. 31, 2013
Revolving Credit Facility
Alternate Base Rate
Maximum
Mar. 31, 2013
Revolving Credit Facility
Euro Dollar Rate
Minimum
Mar. 31, 2013
Revolving Credit Facility
Euro Dollar Rate
Maximum
Mar. 31, 2013
Senior Secured Term Loans
Mar. 31, 2013
Senior Secured Term Loans
Interest Rate Swap Agreements
Mar. 31, 2013
Senior Secured Term Loans
Alternate Base Rate
Jul. 27, 2012
Senior Secured Term Loans
Covenant Requirement
If at any time EBITDA (as defined) is less than $34.0 million but equal to or greater than $30.0 million
Jul. 27, 2012
Senior Secured Term Loans
Covenant Requirement
Minimum
Jul. 27, 2012
Senior Secured Term Loans
Covenant Requirement
Maximum
Dec. 31, 2013
Senior Secured Term Loans
Covenant Requirement
Maximum
Scenario, Forecast
Mar. 31, 2013
Senior Secured Term Loans
Adjusted LIBOR Rate
Mar. 31, 2013
Senior Secured Term Loans
Adjusted LIBOR Rate
Interest Rate Swap Agreements
Mar. 31, 2013
Senior Secured Term Loans
Debt Instrument
Interest Rate Swap Agreements
Debt Instrument [Line Items]                                          
Revolving credit facility commitment       $ 175,000,000                                  
Maturity date       Jul. 27, 2017               Jul. 27, 2018                  
Line of credit facility interest rate description       Borrowings under the Revolving Credit Facility bear interest, at the Company's option, at one of the following rates (i) the Alternate Base Rate, defined as the greater of the Prime Rate, Federal Funds Rate plus 0.5% or the Adjusted LIBO Rate plus 1.0%, plus a margin of 1.0% to 1.75%, or (ii) the Eurodollar Rate, defined as the Adjusted LIBO Rate plus a margin of 2.0% to 2.75%. The respective margins are based upon availability.                                  
Interest Rate Above Federal Funds Rate             0.50%                            
Interest Rate Above Adjusted LIBOR Rate             1.00%                            
Interest rate margin               1.00% 1.75% 2.00% 2.75%     4.00%         5.00%    
Interest rates on outstanding borrowings         2.50% 4.50%                              
Percentage of Line of Credit Facility Unused Capacity Commitment Fee         0.375% 0.50%                              
Open letters of credit       1,100,000                                  
Outstanding borrowing under revolving credit facility       38,300,000                                  
Availability under revolving credit facility       75,000,000                                  
Availability under revolving credit facility, percentage of the total loan commitment       0.429%                                  
Senior secured term loan 29,750,000 30,625,000                   35,000,000                  
Interest rate on outstanding                       5.25%                  
Notional amount     35,000,000                   35,000,000                
Commencement date     2013-03                   2013-03                
Expiry date     Jun. 30, 2018                   Jun. 30, 2018                
Annual interest rate                                       1.05% 6.05%
Earnings before interest taxes depreciation and amortization required under term loan agreement                               30,000,000 34,000,000        
Maximum Indebtedness to EBITDA ratio                             3.0            
Maximum capital expenditures                                   $ 9,000,000