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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
U.S. federal tax statutory rate 35.00% 35.00% 35.00%
State income taxes, net of federal income tax benefit, Rate 2.06% 2.47% 2.38%
Other, Rate 0.14% 0.15% (0.30%)
Annual effective tax expense, Total 37.20% 37.62% 37.08%
U.S. federal tax statutory rate, Amount $ 127,056 $ 86,056 $ 44,163
State income taxes, net of federal income tax benefit, Amount 7,469 6,068 3,004
Other, Amount 533 362 (378)
Annual effective tax expense, Amount $ 135,058 $ 92,486 $ 46,789