Schedule of Applicable Margins Rate (Detail)	3 Months Ended
	Mar. 31, 2015
Debt Instrument [Line Items]
Senior debt ratio	211.00%
Maximum
Debt Instrument [Line Items]
Senior debt ratio	300.00%
Revolving Loan
Debt Instrument [Line Items]
Debt instrument applicable margin	3.25%
Term Loan
Debt Instrument [Line Items]
Debt instrument applicable margin	3.75%
Senior Debt Ratio, ≥ 2.5x | Minimum
Debt Instrument [Line Items]
Senior debt ratio	250.00%
Senior Debt Ratio, ≥ 2.5x | Revolving Loan
Debt Instrument [Line Items]
Debt instrument applicable margin	3.75%
Senior Debt Ratio, ≥ 2.5x | Term Loan
Debt Instrument [Line Items]
Debt instrument applicable margin	4.25%
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, 2.5x, but ≥ 2.0x | Revolving Loan
Debt Instrument [Line Items]
Debt instrument applicable margin	3.25%
Senior Debt Ratio, 2.5x, but ≥ 2.0x | Term Loan
Debt Instrument [Line Items]
Debt instrument applicable margin	3.75%
Senior Debt Ratio, 2.0x | Maximum
Debt Instrument [Line Items]
Senior debt ratio	200.00%
Senior Debt Ratio, 2.0x | Revolving Loan
Debt Instrument [Line Items]
Debt instrument applicable margin	2.75%
Senior Debt Ratio, 2.0x | Term Loan
Debt Instrument [Line Items]
Debt instrument applicable margin	3.25%