Derivative Financial Instruments - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2017	Jan. 31, 2017
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Effective portion of gain (loss) on derivative	$ 100,000,000
Cross Currency Interest Rate Swap Effective Period of Swap December Twenty Three Two Thousand Sixteen To December Thirty One Two Thousand Nineteen [Member]
Derivative [Line Items]
Notional Amount	$ 100,000,000
Effective date of interest rate swap	Dec. 21, 2016
Cross Currency Interest Rate Swap Effective Period of Swap December Twenty Three Two Thousand Sixteen To December Thirty One Two Thousand Eighteen and December Twenty Three Two Thousand Sixteen To June Thirty Two Thousand Seventeen [Member]
Derivative [Line Items]
Notional Amount	$ 70,000,000
Cross Currency Interest Rate Swap Effective Period of Swap December Twenty Three Two Thousand Sixteen To June Thirty Two Thousand Seventeen [Member]
Derivative [Line Items]
Notional Amount	30,000,000
Cross Currency Interest Rate Swap Effective Period of Swap June Thirty Two Thousand Seventeen To December Thirty One Two Thousand Seventeen [Member]
Derivative [Line Items]
Notional Amount	$ 30,000,000
Effective date of interest rate swap	Jun. 28, 2017
Cross Currency Interest Rate Swap Effective Period of Swap June Thirty Two Thousand Seventeen To December Thirty One Two Thousand Seventeen [Member] | Scenario Forecast [Member]
Derivative [Line Items]
Notional Amount		$ 20,000,000
Cross Currency Interest Rate Swap Effective Period of Swap December Twenty Three Two Thousand Sixteen To December Thirty One Two Thousand Eighteen [Member]
Derivative [Line Items]
Notional Amount	$ 40,000,000
Effective date of interest rate swap	Dec. 21, 2016
Cross Currency Interest Rate Swap [Member]
Derivative [Line Items]
Unrealized gain (loss) related to interest rate swaps in accumulated other comprehensive income	$ 700,000
Interest Rate Swap Effective Period Of Swap January Thirty One Two Thousand Seventeen To January Thirty One Two Thousand Twenty [Member]
Derivative [Line Items]
Notional Amount	$ 50,000,000
Effective date of interest rate swap	Jan. 31, 2017
Interest Rate Swap Effective Period Of Swap January Thirty One Two Thousand Seventeen To January Thirty One Two Thousand Twenty [Member] | Two Thousand Fifteen Credit Agreement [Member]
Derivative [Line Items]
Notional Amount			$ 50,000,000
Fixed Rate			1.625%
Effective date of interest rate swap	Jan. 31, 2017
Maturity date of interest rate swap	Jan. 31, 2020
Interest Rate Swap [Member]
Derivative [Line Items]
Unrealized gain (loss) related to interest rate swaps in accumulated other comprehensive income	$ (47,000)