Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
Reconciliation of Income Taxes Computed to Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Effective Tax Rates Line Items      
Income tax expense at the federal statutory rate $ 41,836 $ 92,517 $ 45,427
Valuation allowance     (31,985)
Domestic production activities adjustment 4,256 (1,823) (2,623)
State income taxes 750 603 32
Other 705 220 1,050
Income tax expense (benefit) $ 47,547 $ 91,517 $ 11,901
Income tax expense at the federal statutory rate, tax rate 35.00% 35.00% 35.00%
Valuation allowance, tax rate     (24.60%)
Domestic production activities adjustment, tax rate 3.50% (0.70%) (2.00%)
State income taxes, tax rate 0.60% 0.20%  
Other, tax rate 0.70% 0.10% 0.80%
Effective income tax rate, total 39.80% 34.60% 9.20%