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Stock-Based Compensation--Stock-Based Compensation Cost (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation cost $ 7,819 $ 4,982 $ 6,042
Less: stock-based compensation cost capitalized (2,345) (1,917) (2,295)
Stock-based compensation expense 5,474 3,065 3,747
Recognized tax benefit associated with stock-based compensation 2,031 1,230 1,547
Payments for share based compensation 1,533 1,386 661
Stock-based compensation costs included in accrued payroll and benefits payable 5,080 2,636  
Unrecognized stock-based compensation cost $ 15,867    
Unrecognized compensation recognition period 2 years 11 months 3 days