Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
State and foreign net operating loss carry forwards	$ 30,799	$ 35,089
State tax credits	5,026	4,748
Valuation allowance	10,968	13,177
Increase in valuation allowance	2,200
Unrecognized tax benefits that would impact effective tax rate	2,300
Unrecognized tax benefit that would be offset by tax benefits associated with transfer pricing adjustment	16,800
Unrecognized tax benefit with uncertainty about timing of deductibility	8,700
Accrued interest	$ 2,200	$ 1,300
Minimum
Income Taxes [Line Items]
Period of income tax returns examination after filing	3 years
Maximum
Income Taxes [Line Items]
Period of income tax returns examination after filing	5 years