Income Taxes - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2012 Entity	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Number of wholly owned legal entities	2
Amortization period	9 years 6 months
Current net deferred tax assets			$ 2,200,000	$ 400,000
Long-term net deferred tax assets			3,700,000	1,300,000
Current net deferred tax liabilities			200,000	500,000
Long-term net deferred tax liabilities			852,000	218,000
Valuation allowance			2,200,000	2,086,000	3,077,000	2,676,000
Operating loss carryforwards, expiration beginning year			2019
Operating loss carryforwards, expiration ending year			2028
Operating loss carryforwards relate to a prior acquisition			5,600,000
Deferred income tax benefit		5,900,000
U.S. federal and state capital loss carryforwards			2,300,000
U.S. federal and state capital loss carry forwards expires in 2014			900,000
U.S. federal and state capital loss carry forwards expires in 2016			800,000
U.S. federal and state capital loss carry forwards expires in 2018			600,000
Net tax benefits (deficiencies) from tax deductions in excess of (or less than) book deductions resulting from employee stock option exercises			400,000	(300,000)	500,000
Undistributed earnings of company's foreign subsidiaries			10,700,000
Unrecognized tax benefits			2,012,000	1,844,000	1,269,000	1,222,000
Accrued interest and penalties related to uncertain tax positions			100,000	100,000
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards			7,700,000
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards			$ 25,200,000