Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended			3 Months Ended
	Jan. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined contribution benefit plan expense		$ 2.6	$ 1.8	$ 1.6
Average annual rate of return including CMRT's investment in timet common stock			14.00%
Expected long-term rate of return	7.50%		10.00%	10.00%
Percentage of assets valued using observable inputs from level 1 or level 2		80.00%	83.00%
Canada
Defined Benefit Plan Disclosure [Line Items]
Special termination benefits			0.2
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate		2.50%	3.80%		3.80%
Expected long-term rate of return		5.00%	5.00%	5.20%
Foreign Pension Plans, Defined Benefit | Canada
Defined Benefit Plan Disclosure [Line Items]
Curtailment charge			7.1		7.0
Foreign Pension Plans, Defined Benefit | Canada | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation		45.00%
Foreign Pension Plans, Defined Benefit | Canada | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation		47.00%
Foreign Pension Plans, Defined Benefit | Canada | Cash And Other | Other Investment Securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation		8.00%
Foreign Pension Plans, Defined Benefit | Norway | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return		6.00%
Target asset allocation		11.00%
Foreign Pension Plans, Defined Benefit | Norway | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return		3.00%
Target asset allocation		79.00%
Foreign Pension Plans, Defined Benefit | Norway | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return		5.00%
Target asset allocation		7.00%
Foreign Pension Plans, Defined Benefit | Norway | Real Estate And Other Investments
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation		10.00%
Foreign Pension Plans, Defined Benefit | Norway | Cash And Other | Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return		4.00%
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate		3.80%	4.50%		4.50%
Expected long-term rate of return		7.50%	10.00%	10.00%
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions for pension plans in 2015		18.8
Unrecognized actuarial losses to be recognized in next fiscal year		(15.8)
Unrecognized prior service cost to be recognized in next fiscal year		$ 0.4