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Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Accrued severance funds liability	$ 2.7	$ 2.2
Defined Contribution Pension Plan 401k
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employer matching contribution as percentage of employee's salary deferral contributions	50.00%
Employer contributions amount	$ 1.9	$ 1.8	$ 1.6
Defined Contribution Pension Plan 401k \| Maximum
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employer matching contribution as percentage of employee's eligible compensation	6.00%

The amount of acquisition cost of a business combination allocated to a known and estimated obligation to restructure a portion of the acquired entity through a plan to exit an activity of the acquired entity, involuntarily terminate employees of the acquired entity, and relocate employees of the acquired entity.

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