Schedule of Applicable Margins Rate (Detail)	12 Months Ended
	Dec. 31, 2014
Debt Instrument [Line Items]
Senior debt ratio	176.00%
Maximum
Debt Instrument [Line Items]
Senior debt ratio	300.00%
Senior Debt Ratio, >=2.5x | Minimum
Debt Instrument [Line Items]
Senior debt ratio	250.00%
Senior Debt Ratio, 2.5x, but >= 2.0x | Minimum
Debt Instrument [Line Items]
Senior debt ratio	200.00%
Senior Debt Ratio, 2.5x, but >= 2.0x | Maximum
Debt Instrument [Line Items]
Senior debt ratio	250.00%
Senior Debt Ratio, 2.0 x | Maximum
Debt Instrument [Line Items]
Senior debt ratio	200.00%
Revolving Loan
Debt Instrument [Line Items]
Debt instrument applicable margin	3.75%
Revolving Loan | Senior Debt Ratio, >=2.5x
Debt Instrument [Line Items]
Debt instrument applicable margin	3.75%
Revolving Loan | Senior Debt Ratio, 2.5x, but >= 2.0x
Debt Instrument [Line Items]
Debt instrument applicable margin	3.25%
Revolving Loan | Senior Debt Ratio, 2.0 x
Debt Instrument [Line Items]
Debt instrument applicable margin	2.75%
Term Loan
Debt Instrument [Line Items]
Debt instrument applicable margin	4.25%
Term Loan | Senior Debt Ratio, >=2.5x
Debt Instrument [Line Items]
Debt instrument applicable margin	4.25%
Term Loan | Senior Debt Ratio, 2.5x, but >= 2.0x
Debt Instrument [Line Items]
Debt instrument applicable margin	3.75%
Term Loan | Senior Debt Ratio, 2.0 x
Debt Instrument [Line Items]
Debt instrument applicable margin	3.25%