Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Provision for Income Taxes and Income before Provision for Taxes (Detail)

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Income Taxes - Components of Provision for Income Taxes and Income before Provision for Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Provision Benefit For Income Taxes [Line Items]      
Income tax expense at the federal statutory rate of 35% $ 7,679 $ 17,305 $ 8,332
State income tax expenses, net of federal benefit 985 2,423 1,165
Permanent difference related to compensation charges 3,445    
Other 361 8 180
Provision for income taxes 13,735 21,507 10,355
Tax-sharing agreement [Member]
     
Provision Benefit For Income Taxes [Line Items]      
Difference due to tax-sharing rate $ 1,265 $ 1,771 $ 678