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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 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 3,089 3,361 6,012 6,192
Recognition of Deferred Revenue     (3,697) (3,602)
Deferred Revenue, Period Increase (Decrease)     2,315 2,590
Deferred revenue - right-to-use contracts, as of June 30 70,988 65,569 70,988 65,569
Deferred commission expense, as of January 1     25,251 22,842
Increase (Decrease) in Deferred Charges     2,652 2,393
Commission expense recognized related to right-to-use contracts     (1,318) (1,275)
Sales And Marketing Deferred Commissions Net     1,334 1,118
Deferred commission expense, as of June 30 $ 26,585 $ 23,960 $ 26,585 $ 23,960
Minimum [Member]
        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue Estimated Period Of Recognition     1 year  
Maximum [Member]
        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue Estimated Period Of Recognition     31 years