Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Net operating loss carryforwards, foreign	$ 29,900,000
Foreign related tax credits	3,600,000
California enterprise zone tax credits	5,700,000
Tax credit carry forwards expected to be utilized	3,100,000
Deferred income taxes, undistributed foreign earnings	3,700,000	2,800,000
Impact of repatriation, net of foreign tax credits	0	0
Unrecognized tax benefits, impact on effective tax rate	900,000	1,300,000	1,000,000
Accrued interest and penalties	2,500,000	2,800,000	3,100,000
Increase (decrease) in income tax expense	300,000	300,000	2,300,000
Unrecognized tax benefits, gross	$ 2,200,000
Foreign Countries
Income Taxes [Line Items]
Net operating loss carry forwards expiring in and beyond the stated year	expire in 2015 and later
Tax credit carry forwards expiring in and beyond the stated year	expire in 2024
California enterprise zone [Member]
Income Taxes [Line Items]
Tax credit carry forwards expiring in and beyond the stated year	expire in 2023