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Debt - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended
Sep. 30, 2013
Jul. 01, 2013
Dec. 31, 2012
Jul. 01, 2013
Minimum
Jul. 01, 2013
Maximum
Jul. 01, 2013
Before Extension
Jul. 01, 2013
After Extension
Jul. 01, 2013
Scenario 1
Minimum
Jul. 01, 2013
Scenario 1
Maximum
Jul. 01, 2013
Scenario 2
Minimum
Jul. 01, 2013
Scenario 2
Maximum
Debt Instrument [Line Items]                      
Revolving credit agreement maximum borrowing capacity   $ 500,000                  
Revolving credit agreement maturity date           Apr. 27, 2017 Jul. 01, 2018        
Basis spread               0.875% 2.50% 0.00% 1.50%
Commitment fee percentage on unused portion of the commitment       0.125% 0.35%            
Outstanding amount under revolving line of credit $ 284,800   $ 316,182