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Credit Agreement - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Oct. 15, 2013
Revolving Credit Facility
Subsequent Event
Oct. 15, 2013
Revolving Credit Facility
Subsequent Event
Minimum
Oct. 15, 2013
Revolving Credit Facility
Subsequent Event
Maximum
Sep. 09, 2013
Prior Credit Agreement
Sep. 09, 2013
Prior Credit Agreement
Secured Credit Facility
Sep. 09, 2013
Prior Credit Agreement
Unsecured Credit Facility
Line of Credit Facility [Line Items]            
Revolving credit facility, initiation date Oct. 15, 2013          
Line of credit facility, term 4 years     3 years    
Revolving credit facility, maximum borrowing capacity $ 200.0     $ 100.0 $ 50.0 $ 50.0
Revolving credit facility expiration date Oct. 15, 2017     Sep. 09, 2013    
Borrowing under line of credit, commitment fee percentage   0.125% 0.30%