Long-Term Debt and Notes Payable - Summary of Long-Term Debt Obligations (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Long-term debt consists of:
Long-term borrowing	$ 851,234	$ 864,469
Less: Amounts due within one year	27,749	27,026
Long-Term Debt	823,485	837,443
Senior Notes [Member]
Long-term debt consists of:
Long-term borrowing	491,537	490,354
Term Loan [Member]
Long-term debt consists of:
Long-term borrowing	290,438	291,424
Amortizing Notes [Member]
Long-term debt consists of:
Long-term borrowing	24,329	33,258
Capital lease obligation [Member]
Long-term debt consists of:
Long-term borrowing	2,717	2,802
Other financing [Member]
Long-term debt consists of:
Long-term borrowing		743
North Ocean 105 [Member]
Long-term debt consists of:
Long-term borrowing	$ 42,213	$ 45,888