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Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Leases [Line Items]
Rental expense	$ 2.6	$ 2.1	$ 3.4
Future minimum rental commitments, 2018	2.0
Future minimum rental commitments, 2019	1.8
Future minimum rental commitments, 2020	1.5
Future minimum rental commitments, 2021	1.3
Future minimum rental commitments, 2022	1.3
Future minimum rental commitments, Thereafter	7.2
Sublease rentals to be received	4.3
Future minimum rental commitments for capital leases, 2022	0.0
Imputed interest maximum amount, 2022	0.0
Maximum [Member]
Leases [Line Items]
Future minimum rental commitments for capital leases, 2018	0.1
Future minimum rental commitments for capital leases, 2019	0.1
Future minimum rental commitments for capital leases, 2020	0.1
Future minimum rental commitments for capital leases, 2021	0.1
Imputed interest maximum amount, 2018	0.1
Imputed interest maximum amount, 2019	0.1
Imputed interest maximum amount, 2020	0.1
Imputed interest maximum amount, 2021	$ 0.1

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Capital leases future minimum payments interest included in payments due in five years.

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Capital leases future minimum payments interest included in payments due in four years.

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Capital leases future minimum payments interest included in payments due in three years.

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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