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Income Taxes - Reconciliation of Unrecognized Tax Benefit (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Balance at beginning of year $ 51,244 $ 47,379 $ 50,632
Additions based on tax positions related to the current year 9,073 15,411 10,133
Additions for tax positions of prior years   1,607 131
Reductions for tax positions of prior years   (293)  
Reductions for audit settlements   (895) (4,877)
Reductions resulting from a lapse of the applicable statute of limitations periods (11,479) (11,965) (8,640)
Balance at end of year $ 48,838 $ 51,244 $ 47,379