Supplemental Financial Schedule II, Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	$ 388	$ 394	$ 368
Additions, Costs, and Expenses	242	446	30
Deductions	(25)	(452)	(4)
Balance End of Year	605	388	394
Income tax valuation allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	30,284	698	698
Additions, Costs, and Expenses	4,611	29,586	0
Deductions	0	0	0
Balance End of Year	$ 34,895	$ 30,284	$ 698

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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