Other Liabilities Accrued and other liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	$ 7,359	$ 6,103
Tax-related
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	385	1,197
Accrued compensation and related taxes
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	4,033	3,424
Deferred revenue
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	857	299
Insurance
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	310	0
Professional services
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	608	282
Accrued fuel and rig-related charges
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	652	162
Interest
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	27	25
Other
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	$ 487	$ 714