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Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2013
Interest Rate Swap Agreements
Jun. 30, 2013
Interest Rate Swap Agreements
Cash Flow Hedging
Jun. 30, 2013
Revolving Credit Facility
Jun. 30, 2013
Revolving Credit Facility
Maximum
Jun. 30, 2013
Revolving Credit Facility
Minimum
Jun. 30, 2013
Revolving Credit Facility
Alternate Base Rate
Jun. 30, 2013
Revolving Credit Facility
Alternate Base Rate
Maximum
Jun. 30, 2013
Revolving Credit Facility
Alternate Base Rate
Minimum
Jun. 30, 2013
Revolving Credit Facility
Euro Dollar Rate
Maximum
Jun. 30, 2013
Revolving Credit Facility
Euro Dollar Rate
Minimum
Jun. 30, 2013
Senior Secured Term Loans
Jun. 30, 2013
Senior Secured Term Loans
Interest Rate Swap Agreements
Jun. 30, 2013
Senior Secured Term Loans
Interest Rate Swap Agreements
Cash Flow Hedging
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
Maximum
Dec. 31, 2013
Senior Secured Term Loans
Covenant Requirement
Maximum
Scenario, Forecast
Jul. 27, 2012
Senior Secured Term Loans
Covenant Requirement
Minimum
Jun. 30, 2013
Senior Secured Term Loans
Alternate Base Rate
Jun. 30, 2013
Senior Secured Term Loans
Adjusted LIBOR Rate
Jun. 30, 2013
Senior Secured Term Loans
Adjusted LIBOR Rate
Interest Rate Swap Agreements
Jun. 30, 2013
Senior Secured Term Loans
Debt Instrument
Interest Rate Swap Agreements
Debt Instrument [Line Items]                                          
Revolving credit facility commitment     $ 175.0                                    
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             1.75% 1.00% 2.75% 2.00%               4.00% 5.00%    
Interest rates on outstanding borrowings       4.50% 2.50%                                
Percentage of Line of Credit Facility Unused Capacity Commitment Fee       0.50% 0.375%                                
Open letters of credit     1.1                                    
Outstanding borrowing under revolving credit facility     41.9                                    
Availability under revolving credit facility     81.9                                    
Availability under revolving credit facility, percentage of the total loan commitment     46.80%                                    
Senior secured term loan                     31.5                    
Notional amount   31.5                     31.5                
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                             34.0   30.0        
Maximum Indebtedness to EBITDA ratio                           3.0              
Maximum capital expenditures                               $ 9.0