Company's Debt Maturities on Calendar Year Basis (Detail) - USD ($) $ in Thousands		Jun. 30, 2019		Dec. 31, 2018
Debt Instrument [Line Items]
Total		$ 645,365
July 1 through December 31, 2019		40,017
2020		58,135
2021		61,977
2022		166,131
2023		65,883
Thereafter		253,222
Senior Secured Notes
Debt Instrument [Line Items]
Total		353,163		$ 365,481
July 1 through December 31, 2019		30,375
2020		38,851
2021		42,693
2022		42,693
2023		42,693
Thereafter		155,858
Convertible Notes | 5.75% Senior Subordinated Notes Due August 2023
Debt Instrument [Line Items]
Total		23,190	[1]	48,076
2023	[1]	23,190
Variable Funding Notes
Debt Instrument [Line Items]
Total		97,364	[2]	$ 95,273
Thereafter	[2]	97,364
Senior Secured Term Loan
Debt Instrument [Line Items]
Total	[3]	171,648
July 1 through December 31, 2019	[3]	9,642
2020	[3]	19,284
2021	[3]	19,284
2022	[3]	$ 123,438

[1] Reflects the debt carrying amount which is accounted for under the Fair Value Option in the unaudited condensed consolidated balance sheet as of June 30, 2019. The actual principal outstanding balance of the 5.75% Convertible Notes is $94.6 million as of June 30, 2019.

[2] Reflects the net debt carrying amount, effected by the outstanding balance of the original issue discount, in the unaudited condensed consolidated balance sheet as of June 30, 2019. The actual principal outstanding balance of the Variable Funding Notes is $100.0 million as of June 30, 2019.

[3] Reflects the net debt carrying amount, effected by the outstanding balance of the original issue discount, in the unaudited condensed consolidated balance sheet as of June 30, 2019. The actual principal outstanding balance of the Senior Secured Term Loan is $187.5 million as of June 30, 2019.