16. Geographic area information (Details)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
16. Geographic area information (Details) [Line Items]
Concentration Risk, Percentage	23.00%	27.00%	25.00%
UNITED KINGDOM [MEMBER]
16. Geographic area information (Details) [Line Items]
Concentration Risk, Percentage	52.00%	52.00%	51.00%
PACIFIC RIM [MEMBER]
16. Geographic area information (Details) [Line Items]
Concentration Risk, Percentage	26.00%	18.00%	25.00%
CANADA [MEMBER]
16. Geographic area information (Details) [Line Items]
Concentration Risk, Percentage	10.00%	16.00%	6.00%

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 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611

Reference 2: 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=6927468&loc=d3e6404-108592

Reference 3: 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=28364263&loc=d3e13531-108611

Reference 4: 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=6927468&loc=d3e6351-108592

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration