Company's Debt Maturities on Calendar Year Basis (Detail) - USD ($) $ in Thousands		Mar. 31, 2019		Dec. 31, 2018
Debt Instrument [Line Items]
Total		$ 652,039
April 1 through December 31, 2019		45,897
2020		61,977
2021		61,977
2022		164,874
2023		69,000
Thereafter		248,314
Senior Secured Notes
Debt Instrument [Line Items]
Total		358,079		$ 365,481
April 1 through December 31, 2019		35,291
2020		42,693
2021		42,693
2022		42,693
2023		42,693
Thereafter		152,016
Convertible Notes | 5.75% Senior Subordinated Notes Due August 2023
Debt Instrument [Line Items]
Total		26,307	[1]	48,076
2023	[1]	26,307
Variable Funding Notes
Debt Instrument [Line Items]
Total		96,298	[2]	$ 95,273
Thereafter	[2]	96,298
Senior Secured Term Loan
Debt Instrument [Line Items]
Total	[3]	171,355
April 1 through December 31, 2019	[3]	10,606
2020	[3]	19,284
2021	[3]	19,284
2022	[3]	$ 122,181

[1] Reflects the debt carrying amount which is accounted for under the Fair Value Option in the unaudited condensed consolidated balance sheet as of March 31, 2019. The actual principal outstanding balance of the 5.75% Convertible Notes is $105.7 million as of March 31, 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 March 31, 2019. The actual principal outstanding balance of the Variable Funding Notes is $100.0 million as of March 31, 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 March 31, 2019. The actual principal outstanding balance of the Senior Secured Term Loan is $188.5 million as of March 31, 2019.