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Debt - Additional Information (Detail) (Senior Unsecured Credit Facilities, USD $)
0 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Maximum
Jun. 30, 2014
Minimum
Oct. 12, 2012
KeyBank National Association
Debt Instrument [Line Items]        
Maximum borrowing capacity       $ 200,000,000
Debt instrument borrowing period       5 years
Credit Agreement accordion feature, incremental revolver or term loan amount 50,000,000      
Leverage Ratio   3.50    
Interest Coverage Ratio     3  
Remaining borrowing capacity 75,794,000      
Borrowings outstanding 0      
Amount of outstanding letter of credit $ 4,070,000