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Business and Organization - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012
Organization And Description Of Business [Line Items]
Fiber Optic Licensing Terms, Minimum in years	5 years		5 years	5 years
Fiber Optic Licensing Terms, Maximum in years	25 years		25 years	25 years
Cash paid for acquisition		$ 20.3	$ 37.2
Number of shares issued for acquisition of company		662,426	1,264,687
Common stock value		12.5	24.8
Payment of cash to repay acquiree debt		5.9	5.1
Proceeds from sale of subsidiary				$ 265.0
Electric Power Division [Member] | United States [Member]
Organization And Description Of Business [Line Items]
Number of business acquisitions completed		1	1
Electric Power Division [Member] | Canada [Member]
Organization And Description Of Business [Line Items]
Number of business acquisitions completed			1
Natural Gas and Pipeline Division [Member] | United States [Member]
Organization And Description Of Business [Line Items]
Number of business acquisitions completed			1

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The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

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