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Summary of Significant Accounting Policies - Reconciliation of Activity Related to Allowance for Sales Returns (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]      
Beginning balance $ 8,944 $ 7,334 $ 6,383
Provision 35,746 36,980 32,127
Sales returns (36,542) (35,370) (31,176)
Ending balance $ 8,148 $ 8,944 $ 7,334