Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan expense	$ 5.9	$ 5.8	$ 5.7
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution	15.1
Expect to recognize unrecognized actuarial gains (losses)	(14.4)
Expect to recognize prior service credit\cost	$ 0.2
U.S. Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.90%	4.10%
Long-term return on plan assets	7.50%	7.50%	7.50%
Weighted average discount rate used in determining the net periodic cost	4.10%	3.80%	4.50%
U.S. Defined Benefit Pension Plans | CMRT | Level 1 and Level 2
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value of asset	92.00%	91.00%
Foreign Pension Plan Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.10%	2.60%
Long-term return on plan assets	3.90%	4.60%	5.00%
Weighted average discount rate used in determining the net periodic cost	2.60%	2.50%	3.80%
Foreign Pension Plan Defined Benefit | Canada
Defined Benefit Plan Disclosure [Line Items]
Average basis points of long-term rate of return on investment	1.25%
Foreign Pension Plan Defined Benefit | Level 3 Inputs | Norway
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation	11.00%
Foreign Pension Plan Defined Benefit | Equity Securities | Canada
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation	35.00%
Foreign Pension Plan Defined Benefit | Equity Securities | Norway
Defined Benefit Plan Disclosure [Line Items]
Long-term return on plan assets	7.00%
Percentage of plan asset allocation	11.00%
Foreign Pension Plan Defined Benefit | Fixed Income Funds | Canada
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation	65.00%
Foreign Pension Plan Defined Benefit | Fixed Income Funds | Norway
Defined Benefit Plan Disclosure [Line Items]
Long-term return on plan assets	3.00%
Percentage of plan asset allocation	79.00%
Foreign Pension Plan Defined Benefit | Real Estate | Norway
Defined Benefit Plan Disclosure [Line Items]
Long-term return on plan assets	5.00%
Percentage of plan asset allocation	7.00%
Foreign Pension Plan Defined Benefit | Other Investments And Liquid Funds | Norway
Defined Benefit Plan Disclosure [Line Items]
Long-term return on plan assets	7.00%
OPEB
Defined Benefit Plan Disclosure [Line Items]
Expected contribution	$ 1.1
Discount rate	3.40%	3.60%
Expect to recognize unrecognized actuarial gains (losses)	$ 0.2
Expect to recognize prior service credit\cost	$ 1.1
Eligible age for health care benefits	65 years
Weighted average discount rate used in determining the net periodic cost	3.60%	3.40%	4.00%