Commitments and Contingencies - Additional information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2015 ft²
Commitments And Contingencies [Line Items]
Leased area | ft²			86,000
Estimated sublease income	$ 1.7
Lease Termination Costs and Other Exit Costs
Commitments And Contingencies [Line Items]
Expense related to lease termination penalty	3.7	$ 1.4
Lease Termination Costs
Commitments And Contingencies [Line Items]
Expense related to lease termination penalty	2.9
Other Exit Costs
Commitments And Contingencies [Line Items]
Expense related to lease termination penalty	$ 0.8