Debt - Additional Information (Detail) (USD $)	6 Months Ended					0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Senior PIK Toggle Notes [Member]	Mar. 21, 2014 Senior PIK Toggle Notes [Member]	Mar. 21, 2014 Senior Notes [Member]	Apr. 04, 2014 Medium-term Notes [Member]	Jun. 30, 2014 Medium-term Notes [Member]	Jun. 30, 2014 Amended Senior ABL Facility [Member]	Apr. 04, 2014 Amended Senior ABL Facility [Member]	Apr. 08, 2013 Amended Senior ABL Facility [Member]	Jun. 11, 2014 Amendment No. 1 to Senior ABL Facility [Member]	Apr. 04, 2014 Amendment No. 1 to Senior ABL Facility [Member]	Apr. 04, 2014 LIBOR [Member]	Apr. 04, 2014 Base Rate [Member]
Credit Facilities [Line Items]
Aggregate revolving loan availability								$ 180,000,000	$ 150,000,000	$ 150,000,000	$ 180,000,000
Letter of credit sub-facility									60,000,000	50,000,000
Swing line sub-facility									25,000,000	25,000,000
Uncommitted incremental loan facility									105,000,000	75,000,000		75,000,000
Total Senior ABL Facility									255,000,000	225,000,000	255,000,000
Letters of credit outstanding	35,576,465,000
Aggregate principal amount						750,000,000
Consolidated first lien debt ratio						2.25 to 1.00
Term loan accordion feature						300,000,000
Interest rate accrue	8.50%												1.00%	3.00%
Principle amount outstanding			750,000,000
Debt issuance costs						7,900,000
Discount on Senior PIK Toggle Notes						3,750,000	3,616,000
Percentage tendered				99.00%	49.00%
Loss on extinguishment of debt	30,488,000	0
Original issue discount and debt issuance costs	$ 4,500,000