Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
Tax benefit recognized due to the release of a portion of the valuation allowance on deferred tax assets	$ 15,300,000
Loss carryforwards	14,100,000
Tax credits	5,101,000	6,395,000
Income taxes costs of repatriation	18,700,000
Unrecognized Tax Benefits	7,554,000	7,284,000	5,088,000	5,333,000
Unrecognized tax benefits that will impact tax rate if recognized	4,300,000	7,284,000
Settlements with taxation authorities	3,035,000
Maximum unrecognized tax benefits expected to be recorded in next twelve months	800,000
Unrecognized tax benefit income tax interest and penalties accrued	600,000	1,200,000
Lower Penalties
Income Taxes [Line Items]
Unrecognized Tax Benefits	600,000	300,000
UNITED STATES
Income Taxes [Line Items]
Loss carryforwards	1,500,000
Operating loss carryforwards expiration year	2032
Tax credits	2,700,000
Tax credits, expiration Year	2032
CANADA
Income Taxes [Line Items]
Loss carryforwards	10,500,000
Operating loss carryforwards expiration year	2015
Tax credits	2,400,000
CANADA | Expires through 2022
Income Taxes [Line Items]
Tax credits	1,600,000
Tax credits, expiration Year	2022
CANADA | Carried forward indefinitely
Income Taxes [Line Items]
Tax credits	800,000
UNITED KINGDOM
Income Taxes [Line Items]
Loss carryforwards	1,700,000
Other Countries
Income Taxes [Line Items]
Loss carryforwards	$ 400,000