Profit and Loss Allocations and Distributions - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Distributed Earnings	$ 0	$ 0	$ 0	$ 0

The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 60B

-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 60A

-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 60

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 66

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration