Debt - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 29, 2012
Revolving Credit Facilities
Debt Instrument [Line Items]
Credit facility, initiation date		Jun. 29, 2012
Credit facility, expiration date		Jun. 29, 2017
Credit facility, borrowing capacity			225,000,000
Credit Facility, borrowing			60,000,000
Credit facility, interest rate			1.50%
Weighed average Interest rate on borrowing	1.50%	1.50%
Revolving Credit Facilities | Minimum
Debt Instrument [Line Items]
Credit facility, unused credit commitment fee	0.15%
Credit facility event of default, minimum percentage that a person or group should acquire outstanding capital stock			25.00%
Credit facility, debt covenants compliance		The Company is currently in compliance with all of the debt covenants under the credit agreement
Revolving Credit Facilities | Maximum
Debt Instrument [Line Items]
Credit facility, unused credit commitment fee	0.35%
Revolving Credit Facilities | Maximum | Maximum Leverage ration beyond which amount of cash dividends and other distributions to stockholders is limited
Debt Instrument [Line Items]
Leverage Ratio		2.5
Letter of Credit
Debt Instrument [Line Items]
Credit facility, borrowing capacity			75,000,000
Prior Credit Agreement
Debt Instrument [Line Items]
Credit Facility, borrowing			60,000,000