Equity Compensation Plan - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended		9 Months Ended						0 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended		9 Months Ended		9 Months Ended	12 Months Ended			3 Months Ended		9 Months Ended
	May 26, 2013	Mar. 26, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013	May 26, 2013	Dec. 31, 2012	Mar. 26, 2013 Class D	Sep. 30, 2014 Long Term Incentive Plans	Sep. 30, 2013 Long Term Incentive Plans	Sep. 30, 2014 Long Term Incentive Plans	Sep. 30, 2013 Long Term Incentive Plans	Dec. 31, 2013 Long Term Incentive Plans	Mar. 26, 2013 Long Term Incentive Plans	Sep. 30, 2014 Long Term Incentive Plans Restricted Stock Awards	Dec. 31, 2013 Long Term Incentive Plans Restricted Stock Awards	Sep. 30, 2014 Long Term Incentive Plans Restricted Stock Units (RSUs)	Dec. 31, 2013 Long Term Incentive Plans Restricted Stock Units (RSUs)	Dec. 31, 2013 Long Term Incentive Plans Restricted Stock Units (RSUs) Minimum	Dec. 31, 2013 Long Term Incentive Plans Restricted Stock Units (RSUs) Maximum	Sep. 30, 2014 Management Incentive Plan	Sep. 30, 2013 Management Incentive Plan	Sep. 30, 2014 Management Incentive Plan	Sep. 30, 2013 Management Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock-based compensation expense											$ 900,000	$ 900,000	$ 500,000	$ 3,600,000	$ 600,000									$ 0	$ 0	$ 0	$ 9,000,000
Shares available for issuance																	2,000,000
Shares of the Company's common stock issued (in shares)					16,361		0									23,250				156,397	226,585
Shares issued and vested					40,055	[1]												15,750		16,361
Shares issued and subject to vesting period			362,228	182,092	362,228		182,092	256,092											47,250
Forfeited shares					26,724															7,779	17,470
Vesting period																						2 years	3 years
Forfeited shares																				18,445
Total unearned compensation on restricted stock			6,500,000		6,500,000
Weighted average vesting period					1 year 9 months 4 days
Aggregate fair value of performance based award									7,400,000
Options granted service period	4 years
Option vesting Percentage	25.00%
Outstanding			5,695,671	5,870,138	5,695,671		5,870,138	5,870,138	5,870,138	1,956,713
Weighted average exercise price									$ 17.47
Dividend paid in shares	14,800,000
Withholding For share based Compensation	6,800,000
Dividend distributions declared		14.90%
Dividend distribution paid					3,400,000
Number of options awarded					0		0
Unrecognized compensation cost			0		0
Dividend equivalent rights payable upon vesting			$ 0	$ 0	$ 0		$ 15,400,000

[1] Includes 7,944 shares which were used to settle minimum employee withholding tax obligations for one employee of approximately $0.2 million in 2014. A net of 32,111 shares of common stock were delivered in the nine months ended September 30, 2014.