Reconciliation of Beginning and Ending Balances of Total Amounts of Gross Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits beginning balance	$ 541,000	$ 1,261,000	$ 1,420,000
Increase in tax positions for prior years	11,000	19,000
Decreases in tax positions for prior years			(77,000)
Increase in tax positions for current year	0	0	134,000
Decrease due to settlement with taxing authorities	(641,000)	(641,000)
Lapse in statutes of limitation	(206,000)	(98,000)	(216,000)
Gross unrecognized tax benefits ending balance	$ 346,000	$ 541,000	$ 1,261,000