Annual report pursuant to Section 13 and 15(d)

Change in Rate Based on Leverage Ratio (Detail)

v2.4.0.6
Change in Rate Based on Leverage Ratio (Detail)
Dec. 31, 2012
Less than 3.25 to 1.00 | Base Rate
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 0.75%
Less than 3.25 to 1.00 | EuroDollar Rate Loans
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 2.25%
Less than 3.25 to 1.00 | Applicable Fee Rate
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 0.40%
Greater than or equal to 3.25 to 1.00 but less than 4.50 to 1.00 | Base Rate
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 0.75%
Greater than or equal to 3.25 to 1.00 but less than 4.50 to 1.00 | EuroDollar Rate Loans
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 2.50%
Greater than or equal to 3.25 to 1.00 but less than 4.50 to 1.00 | Applicable Fee Rate
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 0.50%
Greater than or equal to 4.50 to 1.00 but less than 6.00 to 1.00 | Base Rate
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 1.25%
Greater than or equal to 4.50 to 1.00 but less than 6.00 to 1.00 | EuroDollar Rate Loans
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 3.00%
Greater than or equal to 4.50 to 1.00 but less than 6.00 to 1.00 | Applicable Fee Rate
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 0.60%
Greater than or equal to 6.00 to 1.00 | Base Rate
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 2.25%
Greater than or equal to 6.00 to 1.00 | EuroDollar Rate Loans
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 3.50%
Greater than or equal to 6.00 to 1.00 | Applicable Fee Rate
  
Debt Instrument [Line Items]  
Change in rate based on leverage ratio, contractual interest rate 0.75%