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Equity-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares of common stock that may be issued	4,000,000		4,000,000
2011 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares of common stock that may be issued	11,750,000		11,750,000
Restricted Stock Units to be Settled in Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares that may be received by RSU holder			1
Compensation expense related to Restricted Stock Units to be settled in cash	$ 0.7	$ 1.6	$ 3.2	$ 3.2
Payments to settle liabilities under compensation plan	1.2	$ 0.7	3.7	$ 2.9
Accrued liabilities under Compensation Plan	$ 2.4		$ 2.4		$ 2.9
Restricted Stock Units to be Settled in Cash [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for restricted stock and restricted stock units			2 years
Restricted Stock Units to be Settled in Cash [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for restricted stock and restricted stock units			3 years
Restricted Stock and Restricted Stock Units to be Settled in Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	100,000		1,300,000	1,400,000
Granted, weighted average grant date fair value, per share	$ 24.58	$ 36.28	$ 27.70	$ 35.13
Awards vested	100,000		1,200,000	1,000,000
Fair value of restricted stock, vested	$ 1.2	$ 1.2	$ 35.0	$ 36.0
Unrecognized compensation cost, related to unvested restricted stock, total	$ 38.7		$ 38.7
Expected weighted average period to recognize compensation cost on restricted stock and RSUs to be settled in stock (in years)			1 year 8 months 5 days
Restricted Stock and Restricted Stock Units to be Settled in Common Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for restricted stock and restricted stock units			2 years
Restricted Stock and Restricted Stock Units to be Settled in Common Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for restricted stock and restricted stock units			3 years
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	0	0	200,000
Granted, weighted average grant date fair value, per share			$ 28.16
Awards vested	0	0	0	0
Required performance period			3 years
Performance units vesting conditions			These performance units cliff-vest at the end of a three-year performance period based on achievement of three-year company financial performance targets and strategic initiatives established by the Compensation Committee.
Compensation costs	$ 1.1		$ 2.6
Number of common shares issued in connection with performance units	0	0	0	0
Performance Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance units performance percentage			0.00%
Performance Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance units performance percentage			200.00%

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