Reconciliation of Reserve for Uncertain Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Uncertain tax positions, beginning of the year:	$ 24,984	$ 24,653
Gross increases - tax positions in current period	501	331
Uncertain tax positions, end of year	$ 25,485	$ 24,984