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Share-Based Compensation - Schedule of Restricted Stock Units to be Settled in Cash (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning balance of Outstanding, Restricted Stock Units to be Settled in Cash	1,192,078	1,575,050	1,842,455
Restricted Stock Units to be Settled in Cash, Granted		461,428	873,154
Restricted Stock Units to be Settled in Cash, Vested	(650,729)	(610,680)	(444,499)
Restricted Stock Units to be Settled in Cash, Forfeited	(69,621)	(233,720)	(696,060)
Ending balance of Outstanding, Restricted Stock Units to be Settled in Cash	471,728	1,192,078	1,575,050

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period for equity-based payment instruments to be settled in cash.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) to be settled in cash.

+ References

No definition available.

+ Details

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Namespace Prefix:	ceco_
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Balance Type:	na
Period Type:	duration

X

- Definition

The number of non-vested equity-based payment instruments which are to be settled in cash, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	ceco_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period for equity-based payment instruments to be settled in cash.

+ References

No definition available.

+ Details

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Namespace Prefix:	ceco_
Data Type:	xbrli:sharesItemType
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Period Type:	duration

X

- References

No definition available.

+ Details

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Balance Type:	na
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