Financial Ratios under Senior Credit Facility (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Required [Member]
Financial Ratios Under Senior Credit Facility [Line Items]
Leverage Ratio (maximum)	3.5
Interest Coverage Ratio (minimum)	2.75
Actual [Member]
Financial Ratios Under Senior Credit Facility [Line Items]
Leverage Ratio (maximum)	1.63
Interest Coverage Ratio (minimum)	10.39
Tranche Term Facility [Member]
Financial Ratios Under Senior Credit Facility [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 25