Annual report pursuant to Section 13 and 15(d)

Reconciliation of Income Taxes Computed to Income Tax Expense (Detail)

v2.4.0.8
Reconciliation of Income Taxes Computed to Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount [Abstract]      
Income tax expense at the federal statutory rate $ 28,033 $ 41,836 $ 92,517
Qualified domestic production activities   (4,256) 1,823
State income taxes 343 750 603
Other 398 705 220
Income tax expense (benefit) $ 28,774 $ 47,547 $ 91,517
Income tax expense at the federal statutory rate, tax rate 35.00% 35.00% 35.00%
Qualified domestic production activities, tax rate   3.50% (0.70%)
State income taxes, tax rate 0.40% 0.70% 0.20%
Other, tax rate 0.50% 0.60% 0.10%
Effective income tax rate, total 35.90% 39.80% 34.60%