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Deferred Revenue-Right-to-use contracts and Deferred commission expense - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Deferred Revenue Arrangement [Line Items]        
Deferred revenue - right-to-use contracts, as of January 1     $ 68,673 $ 62,979
Right-to-use contracts current period, gross 3,944 3,707 9,956 9,899
Recognition of Deferred Revenue     (5,653) (5,453)
Deferred Revenue, Period Increase (Decrease)     4,303 4,446
Deferred revenue - right-to-use contracts, as of June 30 72,976 67,425 72,976 67,425
Deferred commission expense, as of January 1     25,251 22,841
Increase (Decrease) in Deferred Charges     4,734 3,757
Commission expense recognized related to right-to-use contracts     (2,100) (1,933)
Sales And Marketing Deferred Commissions Net     2,634 1,824
Deferred commission expense, as of June 30 $ 27,885 $ 24,665 $ 27,885 $ 24,665
Deferred Revenue Estimated Period Of Recognition     31 years