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Subsequent Event - Additional Information (Detail) (Subsequent Event [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended
Nov. 04, 2013
Subsequent Event [Line Items]  
Credit facility initiation date Nov. 04, 2013
Revolving credit facility amount $ 20.0
Credit facility fee percentage 0.20%
Line of Credit Facility, Expiration Period 3 years
Minimum [Member]
 
Subsequent Event [Line Items]  
Credit facility interest rate 1.375%
Maximum [Member]
 
Subsequent Event [Line Items]  
Credit facility interest rate 2.00%