Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Indebtedness - Debt Costs - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Debt [Line Items]
Reduction of debt	$ 7.5		$ 6.8
Minimum
Debt [Line Items]
Interest coverage ratio	300.00%	300.00%