For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Segment Reporting - Additional Information (Detail) - Country	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Concentration Risk [Line Items]
Percentage of billings collected through credit cards, resulting in minimal accounts receivable balance	88.00%
Accounts Receivable \| Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk	42.00%		39.00%
Non-US [Member] \| Property, Plant and Equipment \| Geographic Concentration Risk
Concentration Risk [Line Items]
Number of foreign countries representing more than ten percent	0		0
Minimum \| U.S. \| Sales Revenue, Segment \| Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk	90.00%	90.00%
Minimum \| U.S. \| Property, Plant and Equipment \| Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk	85.00%		85.00%