Long Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Revolving Credit Facilities [Member]	Jul. 28, 2014 Revolving Credit Facilities [Member]	Dec. 31, 2013 Revolving Credit Facilities [Member]	Jun. 30, 2014 Term Loan [Member]	Jun. 30, 2013 Term Loan [Member]	Jun. 30, 2014 Term Loan [Member]	Jun. 30, 2013 Term Loan [Member]	Dec. 31, 2013 Term Loan [Member]	Jun. 30, 2014 Promissory Notes [Member]	Dec. 31, 2013 Promissory Notes [Member]	Jul. 28, 2014 Second Lien Credit Agreement Term Loan [Member]
Debt Instrument [Line Items]
Term loan, period								5 years
Weighted-average interest rate for five year Term Loan						3.50%	2.60%	3.40%	2.70%
Total leverage ratio	2.7
Fixed charge coverage ratio	1.5
Principal amount			$ 165.0	$ 120.0		$ 60.0		$ 60.0					$ 70.0
Availability under the revolving credit facility				74.2
Outstanding letters of credit				20.8
Maturity date			Oct. 26, 2017					Oct. 26, 2017
Debt Instrument Periodic Payment Principal								3.0
Long-term debt including current portion	$ 144.3	$ 46.9	$ 105.0		$ 0	$ 39.0		$ 39.0		$ 45.0	$ 0.3	$ 1.9