Commitments and Contingencies - Summary of Consideration Assigned to Identifiable Elements (Detail) $ in Thousands	Sep. 05, 2014 USD ($)
Gain Contingencies [Line Items]
Litigation settlement amount	$ 108,712
Interest income [Member]
Gain Contingencies [Line Items]
Litigation settlement amount	4,866
Implied license [Member]
Gain Contingencies [Line Items]
Litigation settlement amount	85,132
Other damages [Member]
Gain Contingencies [Line Items]
Litigation settlement amount	$ 18,714