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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Equity-Based Compensation - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Oct. 07, 2016	Jun. 15, 2016	Apr. 30, 2016	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016	Apr. 01, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense				$ 2,545,000		$ 1,549,000	$ 34,596,000	$ 4,800,000
Unrecognized equity compensation cost				$ 27,990,000			$ 27,990,000
Weighted average grant date fair value of stock options							$ 3.68
Unvested shares of common stock				3,443,178			3,443,178
Accumulated dividends related to performance shares which vested during the period							$ 3,400,000
Omnibus Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance				15,000,000			15,000,000
Shares available for future issuance				8,773,916			8,773,916
2016 Bonus Plan [Member] \| Scenario Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of bonus payable by cash									50.00%
Long-Term Incentive Plan Below Threshold Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year							0.00%
Long-Term Incentive Plan Threshold Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year							50.00%
Long-Term Incentive Plan Target Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year							100.00%
Long-Term Incentive Plan At or Above Maximum Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year							200.00%
2.25x Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense					$ 27,516,000
Unvested shares of common stock										1,370,821	1,370,821
Accumulated dividends related to performance shares which vested during the period			$ 3,400,000
Bonus Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted shares							497,082
Unvested shares of common stock				460,195			460,195				415,995
Bonus Performance Restricted Shares [Member] \| 2016 Bonus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense							$ 0
Unrecognized equity compensation cost				$ 8,300,000			$ 8,300,000
Bonus Performance Restricted Shares [Member] \| 2016 Bonus Plan [Member] \| Scenario Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of bonus payable by shares									50.00%
Long-Term Incentive Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period							4 years
Vesting percentage, per year							25.00%
Long-Term Incentive Options, expiration period							10 years
Long-Term Incentive Time Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period							4 years
Vesting percentage, per year							25.00%
Long-Term Incentive Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted shares							198,426
Unvested shares of common stock				220,288			220,288				62,365
Long-Term Incentive Performance Restricted Shares [Member] \| Fiscal 2016 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized equity compensation cost				$ 3,200,000			$ 3,200,000
Number of shares not probable of vesting							175,750
Long-Term Incentive Performance Restricted Shares [Member] \| Fiscal 2015 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized equity compensation cost				$ 120,000			$ 120,000
Long-Term Incentive Performance Restricted Shares [Member] \| 2015 and 2016 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period							3 years
Shares earned, percentage							33.00%
Long-Term Incentive Performance Restricted Shares [Member] \| 2016 Long-Term Incentive Plan [Member] \| Maximum Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awarded shares							393,686
Long-Term Incentive Performance Restricted Shares [Member] \| 2016 Long-Term Incentive Plan [Member] \| Fiscal 2016 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted shares							131,212
Long-Term Incentive Performance Restricted Shares [Member] \| 2015 Long-Term Incentive Plan [Member] \| Maximum Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awarded shares							133,640
Long-Term Incentive Performance Restricted Shares [Member] \| 2015 Long-Term Incentive Plan [Member] \| Fiscal 2016 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted shares							44,538
Performance Restricted Shares [Member] \| Equity Plan Modifications [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Modified shares				413,445			413,445
2.75x Performance Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense							$ 0	$ 0
Unrecognized equity compensation cost				$ 11,000,000			$ 11,000,000
Unvested shares of common stock				1,329,027			1,329,027				1,370,821
Return on investment				2.75%			2.75%
Annualized effective compounded return rate							15.00%
2.75x Performance Restricted Shares [Member] \| Subsequent Events [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional future funds to receive	$ 421,000,000
Time-Vesting Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted shares		53,333					545,968
Unvested shares of common stock				1,126,630			1,126,630				883,270
Time-Vesting Restricted Shares [Member] \| Three Year Vesting [Member] \| Board Members [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		3 years
Granted shares		7,619
Time-Vesting Restricted Shares [Member] \| One Year Vesting [Member] \| Board Members [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year		100.00%
Granted shares		45,714