Long-Term Debt and Notes Payable - Summary of Long-Term Debt Obligations (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Long-term debt consists of:
Long-term borrowing	$ 308,178	$ 88,562
Less: Amounts due within one year	258,417	39,543
Total long-term debt	49,761	49,019
Former Credit Agreement [Member]
Long-term debt consists of:
Long-term borrowing	250,000
Other financing [Member]
Long-term debt consists of:
Long-term borrowing	989
North Ocean Construction Financing [Member] | North Ocean 102 [Member]
Long-term debt consists of:
Long-term borrowing		31,373
North Ocean Construction Financing [Member] | North Ocean 105 [Member]
Long-term debt consists of:
Long-term borrowing	$ 57,189	$ 57,189