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Components of Change in Deferred Revenue-Entry of Right-to-Use Contracts and Deferred Commission Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred Revenue Arrangement [Line Items]      
Right To Use Contracts Current Period Gross $ 13,142 $ 13,433 $ 17,856
Deferred revenue - entry of right-to-use contracts, beginning balance 62,979 56,285  
Net increase in deferred revenue 5,694 6,694  
Deferred revenue - entry of right-to-use contracts, ending balance 68,673 62,979 56,285
Deferred commission expense, beginning balance 22,841 19,686  
Costs deferred 5,011 5,465 6,735
Commission expense recognized (2,601) (2,310) (1,946)
Net increase in deferred commission expense 2,410 3,155 4,789
Deferred commission expense, ending balance 25,251 22,841 19,686
Recognition of Deferred Revenue $ (7,448) $ (6,739) $ (5,920)