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Reconciliation of Differences Between Effective Tax Rate and Federal Statutory Tax Rate (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Federal statutory tax rate 35.00% 35.00% 35.00%
State income taxes, net of federal income tax benefit 3.50% 4.30% 3.50%
Non-deductible employee stock purchase plan expense 0.30% 0.30% 0.30%
Non-deductible meals and entertainment 0.30% 0.30% 0.30%
Other, net 0.20% (0.30%) 0.30%
Effective tax rate 39.30% 39.60% 39.40%