Company's Debt Maturities on Calendar Year Basis (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Total	$ 808,248
2018	278,248
2019	44,350
2020	135,713
2021	44,350
2022	110,878
Thereafter	194,709
Senior Secured Notes
Debt Instrument [Line Items]
Total	408,174
2018	42,693
2019	42,693
2020	42,693
2021	42,693
2022	42,693
Thereafter	194,709
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018
Debt Instrument [Line Items]
Total	233,898	[1]
2018	233,898	[1]
Variable Funding Notes
Debt Instrument [Line Items]
Total	91,363	[2]
2020	91,363	[2]
2017 Senior Secured Term Loan
Debt Instrument [Line Items]
Total	74,813	[3]
2018	1,657	[3]
2019	1,657	[3]
2020	1,657	[3]
2021	1,657	[3]
2022	$ 68,185	[3]

[1] Reflects the net debt carrying amount of the 1.50% Convertible Notes in the consolidated balance sheet as of December 31, 2016, in accordance with accounting for convertible notes. After taking into effect the total $163.8 million ($104.9 million in FY 2016 and $58.9 million of repurchases in FY 2017) of the 1.50% Convertible Notes as discussed above, the remaining principal amount owed to the holders of the 1.50% Convertible Notes is $236.2 million. On February 22, 2018, the Company exchanged $125 million of aggregate principal amount of 1.50% Convertible Notes for $125 million of aggregate principal amount of 5.75% Convertible Notes, and on March 14, 2018, the Company drew down $110 million under the Second Delayed Draw Term Loan and used those proceeds, along with cash on hand, to make a payment to the trustee under the indenture governing the 1.50% Convertible Notes to repay the remaining 1.50% Convertible Notes at maturity on March 15, 2018. In accordance with ASC 470, as the terms of the 5.75% Convertible Notes and the Second Delayed Draw Term Loan are readably determinable and the 5.75% Convertible Notes and the Second Delayed Draw Term Loan are scheduled to mature on August 15, 2023 and August 2, 2022, respectively, the Company has classified the 1.50% Convertible outstanding debt balance (which is net of deferred financing costs and original issue discount) of $233.9 million as long-term debt on its December 31, 2017 consolidated balance sheet.

[2] Reflects the net debt carrying amount, effected by the outstanding balance of the original issue discount, in the consolidated balance sheet as of December 31, 2017. The actual principal outstanding balance of the Variable Funding Notes is $100.0 million as of December 31, 2017

[3] Reflects the net debt carrying amount, effected by the outstanding balance of the original issue discount, in the consolidated balance sheet as of December 31, 2017. The actual principal outstanding balance of the 2017 Senior Secured Term Loan is $82.8 million as of December 31, 2017.