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Stockholders' Equity - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Employees
Dec. 31, 2011
Employees
Dec. 31, 2010
Employees
Jul. 31, 2012
Maximum
Aug. 31, 2007
Maximum
Dec. 31, 2012
Stock Repurchase Plan
Dec. 31, 2011
Stock Repurchase Plan
Dec. 31, 2010
Stock Repurchase Plan
Dec. 31, 2012
New Stock Repurchase Program
Feb. 06, 2013
Dividend Declared
Subsequent Event
Stockholders Equity Note [Line Items]                                                  
Dividend declaration date                                                 Feb. 06, 2013
Dividend per share, declared                                                 $ 0.05
Dividend payment date Dec. 28, 2012 Sep. 28, 2012 Jun. 29, 2012 Mar. 30, 2012 Dec. 30, 2011 Sep. 30, 2011 Jun. 30, 2011 Mar. 30, 2011 Dec. 30, 2010 Sep. 30, 2010 Jun. 30, 2010 Mar. 31, 2010                         Mar. 29, 2013
Dividend record date                                                 Mar. 15, 2013
Amount approved for repurchases under stock buyback program                                     $ 150,000,000 $ 250,000,000       $ 51,100,000  
Treasury stock shares acquired                               86,932 135,068 117,083     4,700,000 8,689 8,743 5,900,000  
Purchase price for treasury stock acquired                         $ 170,292,000 $ 4,314,000 $ 1,853,000 $ 1,300,000 $ 4,100,000 $ 1,700,000     $ 70,100,000 $ 255,000 $ 123,000 $ 98,900,000