Future Minimum Rent Payments Under Noncancellable Operating Leases And Anticipated Payments Related to One-Time Transition Tax (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2018	$ 24,508
2019	20,059
2020	18,779
2021	2,610
2022	1,758
Thereafter	4,276
Total future minimum rent payments under noncancellable operating leases	71,990
2018	3,450
2019	3,200
2020	3,200
2021	3,200
2022	3,200
Thereafter	24,000
Total anticipated payments under one-time transition tax	$ 40,250

One-time transition tax future minimum payments due related to Tax Cuts and Jobs Act enacted in 2017.

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One time transition tax future minimum payments due in four years.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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